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2022-10-11treewide: use prandom_u32_max() when possible, part 1Jason A. Donenfeld1-1/+1
Rather than incurring a division or requesting too many random bytes for the given range, use the prandom_u32_max() function, which only takes the minimum required bytes from the RNG and avoids divisions. This was done mechanically with this coccinelle script: @basic@ expression E; type T; identifier get_random_u32 =~ "get_random_int|prandom_u32|get_random_u32"; typedef u64; @@ ( - ((T)get_random_u32() % (E)) + prandom_u32_max(E) | - ((T)get_random_u32() & ((E) - 1)) + prandom_u32_max(E * XXX_MAKE_SURE_E_IS_POW2) | - ((u64)(E) * get_random_u32() >> 32) + prandom_u32_max(E) | - ((T)get_random_u32() & ~PAGE_MASK) + prandom_u32_max(PAGE_SIZE) ) @multi_line@ identifier get_random_u32 =~ "get_random_int|prandom_u32|get_random_u32"; identifier RAND; expression E; @@ - RAND = get_random_u32(); ... when != RAND - RAND %= (E); + RAND = prandom_u32_max(E); // Find a potential literal @literal_mask@ expression LITERAL; type T; identifier get_random_u32 =~ "get_random_int|prandom_u32|get_random_u32"; position p; @@ ((T)get_random_u32()@p & (LITERAL)) // Add one to the literal. @script:python add_one@ literal << literal_mask.LITERAL; RESULT; @@ value = None if literal.startswith('0x'): value = int(literal, 16) elif literal[0] in '123456789': value = int(literal, 10) if value is None: print("I don't know how to handle %s" % (literal)) cocci.include_match(False) elif value == 2**32 - 1 or value == 2**31 - 1 or value == 2**24 - 1 or value == 2**16 - 1 or value == 2**8 - 1: print("Skipping 0x%x for cleanup elsewhere" % (value)) cocci.include_match(False) elif value & (value + 1) != 0: print("Skipping 0x%x because it's not a power of two minus one" % (value)) cocci.include_match(False) elif literal.startswith('0x'): coccinelle.RESULT = cocci.make_expr("0x%x" % (value + 1)) else: coccinelle.RESULT = cocci.make_expr("%d" % (value + 1)) // Replace the literal mask with the calculated result. @plus_one@ expression literal_mask.LITERAL; position literal_mask.p; expression add_one.RESULT; identifier FUNC; @@ - (FUNC()@p & (LITERAL)) + prandom_u32_max(RESULT) @collapse_ret@ type T; identifier VAR; expression E; @@ { - T VAR; - VAR = (E); - return VAR; + return E; } @drop_var@ type T; identifier VAR; @@ { - T VAR; ... when != VAR } Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Reviewed-by: Kees Cook <keescook@chromium.org> Reviewed-by: Yury Norov <yury.norov@gmail.com> Reviewed-by: KP Singh <kpsingh@kernel.org> Reviewed-by: Jan Kara <jack@suse.cz> # for ext4 and sbitmap Reviewed-by: Christoph Böhmwalder <christoph.boehmwalder@linbit.com> # for drbd Acked-by: Jakub Kicinski <kuba@kernel.org> Acked-by: Heiko Carstens <hca@linux.ibm.com> # for s390 Acked-by: Ulf Hansson <ulf.hansson@linaro.org> # for mmc Acked-by: Darrick J. Wong <djwong@kernel.org> # for xfs Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2022-07-25net: Fix data-races around sysctl_[rw]mem(_offset)?.Kuniyuki Iwashima1-1/+1
While reading these sysctl variables, they can be changed concurrently. Thus, we need to add READ_ONCE() to their readers. - .sysctl_rmem - .sysctl_rwmem - .sysctl_rmem_offset - .sysctl_wmem_offset - sysctl_tcp_rmem[1, 2] - sysctl_tcp_wmem[1, 2] - sysctl_decnet_rmem[1] - sysctl_decnet_wmem[1] - sysctl_tipc_rmem[1] Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2022-06-29net: tipc: fix possible refcount leak in tipc_sk_create()Hangyu Hua1-0/+1
Free sk in case tipc_sk_insert() fails. Signed-off-by: Hangyu Hua <hbh25y@gmail.com> Reviewed-by: Tung Nguyen <tung.q.nguyen@dektech.com.au> Signed-off-by: David S. Miller <davem@davemloft.net>
2022-03-22tipc: fix the timer expires after interval 100msHoang Le1-1/+2
In the timer callback function tipc_sk_timeout(), we're trying to reschedule another timeout to retransmit a setup request if destination link is congested. But we use the incorrect timeout value (msecs_to_jiffies(100)) instead of (jiffies + msecs_to_jiffies(100)), so that the timer expires immediately, it's irrelevant for original description. In this commit we correct the timeout value in sk_reset_timer() Fixes: 6787927475e5 ("tipc: buffer overflow handling in listener socket") Acked-by: Ying Xue <ying.xue@windriver.com> Signed-off-by: Hoang Le <hoang.h.le@dektech.com.au> Link: https://lore.kernel.org/r/20220321042229.314288-1-hoang.h.le@dektech.com.au Signed-off-by: Paolo Abeni <pabeni@redhat.com>
2022-02-23tipc: Fix end of loop tests for list_for_each_entry()Dan Carpenter1-1/+1
These tests are supposed to check if the loop exited via a break or not. However the tests are wrong because if we did not exit via a break then "p" is not a valid pointer. In that case, it's the equivalent of "if (*(u32 *)sr == *last_key) {". That's going to work most of the time, but there is a potential for those to be equal. Fixes: 1593123a6a49 ("tipc: add name table dump to new netlink api") Fixes: 1a1a143daf84 ("tipc: add publication dump to new netlink api") Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2021-12-31net ticp:fix a kernel-infoleak in __tipc_sendmsg()Haimin Zhang1-0/+2
struct tipc_socket_addr.ref has a 4-byte hole,and __tipc_getname() currently copying it to user space,causing kernel-infoleak. BUG: KMSAN: kernel-infoleak in instrument_copy_to_user include/linux/instrumented.h:121 [inline] BUG: KMSAN: kernel-infoleak in instrument_copy_to_user include/linux/instrumented.h:121 [inline] lib/usercopy.c:33 BUG: KMSAN: kernel-infoleak in _copy_to_user+0x1c9/0x270 lib/usercopy.c:33 lib/usercopy.c:33 instrument_copy_to_user include/linux/instrumented.h:121 [inline] instrument_copy_to_user include/linux/instrumented.h:121 [inline] lib/usercopy.c:33 _copy_to_user+0x1c9/0x270 lib/usercopy.c:33 lib/usercopy.c:33 copy_to_user include/linux/uaccess.h:209 [inline] copy_to_user include/linux/uaccess.h:209 [inline] net/socket.c:287 move_addr_to_user+0x3f6/0x600 net/socket.c:287 net/socket.c:287 __sys_getpeername+0x470/0x6b0 net/socket.c:1987 net/socket.c:1987 __do_sys_getpeername net/socket.c:1997 [inline] __se_sys_getpeername net/socket.c:1994 [inline] __do_sys_getpeername net/socket.c:1997 [inline] net/socket.c:1994 __se_sys_getpeername net/socket.c:1994 [inline] net/socket.c:1994 __x64_sys_getpeername+0xda/0x120 net/socket.c:1994 net/socket.c:1994 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_x64 arch/x86/entry/common.c:51 [inline] arch/x86/entry/common.c:82 do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x44/0xae Uninit was stored to memory at: tipc_getname+0x575/0x5e0 net/tipc/socket.c:757 net/tipc/socket.c:757 __sys_getpeername+0x3b3/0x6b0 net/socket.c:1984 net/socket.c:1984 __do_sys_getpeername net/socket.c:1997 [inline] __se_sys_getpeername net/socket.c:1994 [inline] __do_sys_getpeername net/socket.c:1997 [inline] net/socket.c:1994 __se_sys_getpeername net/socket.c:1994 [inline] net/socket.c:1994 __x64_sys_getpeername+0xda/0x120 net/socket.c:1994 net/socket.c:1994 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_x64 arch/x86/entry/common.c:51 [inline] arch/x86/entry/common.c:82 do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x44/0xae Uninit was stored to memory at: msg_set_word net/tipc/msg.h:212 [inline] msg_set_destport net/tipc/msg.h:619 [inline] msg_set_word net/tipc/msg.h:212 [inline] net/tipc/socket.c:1486 msg_set_destport net/tipc/msg.h:619 [inline] net/tipc/socket.c:1486 __tipc_sendmsg+0x44fa/0x5890 net/tipc/socket.c:1486 net/tipc/socket.c:1486 tipc_sendmsg+0xeb/0x140 net/tipc/socket.c:1402 net/tipc/socket.c:1402 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg net/socket.c:724 [inline] sock_sendmsg_nosec net/socket.c:704 [inline] net/socket.c:2409 sock_sendmsg net/socket.c:724 [inline] net/socket.c:2409 ____sys_sendmsg+0xe11/0x12c0 net/socket.c:2409 net/socket.c:2409 ___sys_sendmsg net/socket.c:2463 [inline] ___sys_sendmsg net/socket.c:2463 [inline] net/socket.c:2492 __sys_sendmsg+0x704/0x840 net/socket.c:2492 net/socket.c:2492 __do_sys_sendmsg net/socket.c:2501 [inline] __se_sys_sendmsg net/socket.c:2499 [inline] __do_sys_sendmsg net/socket.c:2501 [inline] net/socket.c:2499 __se_sys_sendmsg net/socket.c:2499 [inline] net/socket.c:2499 __x64_sys_sendmsg+0xe2/0x120 net/socket.c:2499 net/socket.c:2499 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_x64 arch/x86/entry/common.c:51 [inline] arch/x86/entry/common.c:82 do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x44/0xae Local variable skaddr created at: __tipc_sendmsg+0x2d0/0x5890 net/tipc/socket.c:1419 net/tipc/socket.c:1419 tipc_sendmsg+0xeb/0x140 net/tipc/socket.c:1402 net/tipc/socket.c:1402 Bytes 4-7 of 16 are uninitialized Memory access of size 16 starts at ffff888113753e00 Data copied to user address 0000000020000280 Reported-by: syzbot+cdbd40e0c3ca02cae3b7@syzkaller.appspotmail.com Signed-off-by: Haimin Zhang <tcs_kernel@tencent.com> Acked-by: Jon Maloy <jmaloy@redhat.com> Link: https://lore.kernel.org/r/1640918123-14547-1-git-send-email-tcs.kernel@gmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2021-09-13tipc: increase timeout in tipc_sk_enqueue()Hoang Le1-1/+1
In tipc_sk_enqueue() we use hardcoded 2 jiffies to extract socket buffer from generic queue to particular socket. The 2 jiffies is too short in case there are other high priority tasks get CPU cycles for multiple jiffies update. As result, no buffer could be enqueued to particular socket. To solve this, we switch to use constant timeout 20msecs. Then, the function will be expired between 2 jiffies (CONFIG_100HZ) and 20 jiffies (CONFIG_1000HZ). Fixes: c637c1035534 ("tipc: resolve race problem at unicast message reception") Acked-by: Jon Maloy <jmaloy@redhat.com> Signed-off-by: Hoang Le <hoang.h.le@dektech.com.au> Signed-off-by: David S. Miller <davem@davemloft.net>
2021-09-03tipc: clean up inconsistent indentingColin Ian King1-1/+1
There is a statement that is indented one character too deeply, clean this up. Signed-off-by: Colin Ian King <colin.king@canonical.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2021-08-19Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/netJakub Kicinski1-1/+1
drivers/ptp/Kconfig: 55c8fca1dae1 ("ptp_pch: Restore dependency on PCI") e5f31552674e ("ethernet: fix PTP_1588_CLOCK dependencies") Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2021-08-16tipc: call tipc_wait_for_connect only when dlen is not 0Xin Long1-1/+1
__tipc_sendmsg() is called to send SYN packet by either tipc_sendmsg() or tipc_connect(). The difference is in tipc_connect(), it will call tipc_wait_for_connect() after __tipc_sendmsg() to wait until connecting is done. So there's no need to wait in __tipc_sendmsg() for this case. This patch is to fix it by calling tipc_wait_for_connect() only when dlen is not 0 in __tipc_sendmsg(), which means it's called by tipc_connect(). Note this also fixes the failure in tipcutils/test/ptts/: # ./tipcTS & # ./tipcTC 9 (hang) Fixes: 36239dab6da7 ("tipc: fix implicit-connect for SYN+") Reported-by: Shuang Li <shuali@redhat.com> Signed-off-by: Xin Long <lucien.xin@gmail.com> Acked-by: Jon Maloy <jmaloy@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2021-07-31Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/netJakub Kicinski1-13/+17
Conflicting commits, all resolutions pretty trivial: drivers/bus/mhi/pci_generic.c 5c2c85315948 ("bus: mhi: pci-generic: configurable network interface MRU") 56f6f4c4eb2a ("bus: mhi: pci_generic: Apply no-op for wake using sideband wake boolean") drivers/nfc/s3fwrn5/firmware.c a0302ff5906a ("nfc: s3fwrn5: remove unnecessary label") 46573e3ab08f ("nfc: s3fwrn5: fix undefined parameter values in dev_err()") 801e541c79bb ("nfc: s3fwrn5: fix undefined parameter values in dev_err()") MAINTAINERS 7d901a1e878a ("net: phy: add Maxlinear GPY115/21x/24x driver") 8a7b46fa7902 ("MAINTAINERS: add Yasushi SHOJI as reviewer for the Microchip CAN BUS Analyzer Tool driver") Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2021-07-25tipc: fix an use-after-free issue in tipc_recvmsgXin Long1-3/+5
syzbot reported an use-after-free crash: BUG: KASAN: use-after-free in tipc_recvmsg+0xf77/0xf90 net/tipc/socket.c:1979 Call Trace: tipc_recvmsg+0xf77/0xf90 net/tipc/socket.c:1979 sock_recvmsg_nosec net/socket.c:943 [inline] sock_recvmsg net/socket.c:961 [inline] sock_recvmsg+0xca/0x110 net/socket.c:957 tipc_conn_rcv_from_sock+0x162/0x2f0 net/tipc/topsrv.c:398 tipc_conn_recv_work+0xeb/0x190 net/tipc/topsrv.c:421 process_one_work+0x98d/0x1630 kernel/workqueue.c:2276 worker_thread+0x658/0x11f0 kernel/workqueue.c:2422 As Hoang pointed out, it was caused by skb_cb->bytes_read still accessed after calling tsk_advance_rx_queue() to free the skb in tipc_recvmsg(). This patch is to fix it by accessing skb_cb->bytes_read earlier than calling tsk_advance_rx_queue(). Fixes: f4919ff59c28 ("tipc: keep the skb in rcv queue until the whole data is read") Reported-by: syzbot+e6741b97d5552f97c24d@syzkaller.appspotmail.com Signed-off-by: Xin Long <lucien.xin@gmail.com> Acked-by: Jon Maloy <jmaloy@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2021-07-23tipc: fix sleeping in tipc accept routineHoang Le1-5/+4
The release_sock() is blocking function, it would change the state after sleeping. In order to evaluate the stated condition outside the socket lock context, switch to use wait_woken() instead. Fixes: 6398e23cdb1d8 ("tipc: standardize accept routine") Acked-by: Jon Maloy <jmaloy@redhat.com> Signed-off-by: Hoang Le <hoang.h.le@dektech.com.au> Signed-off-by: David S. Miller <davem@davemloft.net>
2021-07-23tipc: fix implicit-connect for SYN+Xin Long1-8/+13
For implicit-connect, when it's either SYN- or SYN+, an ACK should be sent back to the client immediately. It's not appropriate for the client to enter established state only after receiving data from the server. On client side, after the SYN is sent out, tipc_wait_for_connect() should be called to wait for the ACK if timeout is set. This patch also restricts __tipc_sendstream() to call __sendmsg() only when it's in TIPC_OPEN state, so that the client can program in a single loop doing both connecting and data sending like: for (...) sendmsg(dest, buf); This makes the implicit-connect more implicit. Fixes: b97bf3fd8f6a ("[TIPC] Initial merge") Signed-off-by: Xin Long <lucien.xin@gmail.com> Acked-by: Jon Maloy <jmaloy@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2021-07-16tipc: keep the skb in rcv queue until the whole data is readXin Long1-9/+27
Currently, when userspace reads a datagram with a buffer that is smaller than this datagram, the data will be truncated and only part of it can be received by users. It doesn't seem right that users don't know the datagram size and have to use a huge buffer to read it to avoid the truncation. This patch to fix it by keeping the skb in rcv queue until the whole data is read by users. Only the last msg of the datagram will be marked with MSG_EOR, just as TCP/SCTP does. Note that this will work as above only when MSG_EOR is set in the flags parameter of recvmsg(), so that it won't break any old user applications. Signed-off-by: Xin Long <lucien.xin@gmail.com> Acked-by: Jon Maloy <jmaloy@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2021-06-10tipc: socket.c: fix the use of copular verbgushengxian1-1/+1
Fix the use of copular verb. Signed-off-by: gushengxian <gushengxian@yulong.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2021-06-03tipc: simplify handling of lookup scope during multicast message receptionJon Maloy1-16/+10
We introduce a new macro TIPC_ANY_SCOPE to make the handling of the lookup scope value more comprehensible during multicast reception. The (unchanged) rules go as follows: 1) Multicast messages sent from own node are delivered to all matching sockets on the own node, irrespective of their binding scope. 2) Multicast messages sent from other nodes arrive here because they have found TIPC_CLUSTER_SCOPE bindings emanating from this node. Those messages should be delivered to exactly those sockets, but not to local sockets bound with TIPC_NODE_SCOPE, since the latter obviously were not meant to be visible for those senders. 3) Group multicast/broadcast messages are delivered to the sockets with a binding scope matching exactly the lookup scope indicated in the message header, and nobody else. Reviewed-by: Xin Long <lucien.xin@gmail.com> Tested-by: Hoang Le <hoang.h.le@dektech.com.au> Signed-off-by: Jon Maloy <jmaloy@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2021-06-03tipc: refactor function tipc_sk_anc_data_recv()Jon Maloy1-47/+38
We refactor tipc_sk_anc_data_recv() to make it slightly more comprehensible, but also to facilitate application of some additions to the code in a future commit. Reviewed-by: Xin Long <lucien.xin@gmail.com> Tested-by: Hoang Le <hoang.h.le@dektech.com.au> Signed-off-by: Jon Maloy <jmaloy@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2021-06-03tipc: eliminate redundant fields in struct tipc_sockJon Maloy1-26/+27
We eliminate the redundant fields conn_type and conn_instance in struct tipc_sock. On the connecting side, this information is already present in the unused (after the connection is established) part of the pre-allocated header, and on the accepting side, we put it there when the new socket is created. Reviewed-by: Xin Long <lucien.xin@gmail.com> Tested-by: Hoang Le <hoang.h.le@dektech.com.au> Signed-off-by: Jon Maloy <jmaloy@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2021-05-14Revert "net:tipc: Fix a double free in tipc_sk_mcast_rcv"Hoang Le1-1/+4
This reverts commit 6bf24dc0cc0cc43b29ba344b66d78590e687e046. Above fix is not correct and caused memory leak issue. Fixes: 6bf24dc0cc0c ("net:tipc: Fix a double free in tipc_sk_mcast_rcv") Acked-by: Jon Maloy <jmaloy@redhat.com> Acked-by: Tung Nguyen <tung.q.nguyen@dektech.com.au> Signed-off-by: Hoang Le <hoang.h.le@dektech.com.au> Signed-off-by: David S. Miller <davem@davemloft.net>
2021-04-09Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/netJakub Kicinski1-1/+1
Conflicts: MAINTAINERS - keep Chandrasekar drivers/net/ethernet/mellanox/mlx5/core/en_main.c - simple fix + trust the code re-added to param.c in -next is fine include/linux/bpf.h - trivial include/linux/ethtool.h - trivial, fix kdoc while at it include/linux/skmsg.h - move to relevant place in tcp.c, comment re-wrapped net/core/skmsg.c - add the sk = sk // sk = NULL around calls net/tipc/crypto.c - trivial Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2021-03-29tipc: fix htmldoc and smatch warningsJon Maloy1-1/+1
We fix a warning from the htmldoc tool and an indentation error reported by smatch. There are no functional changes in this commit. Signed-off-by: Jon Maloy <jmaloy@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2021-03-29net:tipc: Fix a double free in tipc_sk_mcast_rcvLv Yunlong1-1/+1
In the if(skb_peek(arrvq) == skb) branch, it calls __skb_dequeue(arrvq) to get the skb by skb = skb_peek(arrvq). Then __skb_dequeue() unlinks the skb from arrvq and returns the skb which equals to skb_peek(arrvq). After __skb_dequeue(arrvq) finished, the skb is freed by kfree_skb(__skb_dequeue(arrvq)) in the first time. Unfortunately, the same skb is freed in the second time by kfree_skb(skb) after the branch completed. My patch removes kfree_skb() in the if(skb_peek(arrvq) == skb) branch, because this skb will be freed by kfree_skb(skb) finally. Fixes: cb1b728096f54 ("tipc: eliminate race condition at multicast reception") Signed-off-by: Lv Yunlong <lyl2019@mail.ustc.edu.cn> Signed-off-by: David S. Miller <davem@davemloft.net>
2021-03-17tipc: simplify signature of tipc_find_service()Jon Maloy1-1/+1
We reduce the signature of tipc_find_service() and tipc_create_service(). The reason for doing this might not be obvious, but we plan to let struct tipc_uaddr contain information that is relevant for these functions in a later commit. Signed-off-by: Jon Maloy <jmaloy@redhat.com> Acked-by: Ying Xue <ying.xue@windriver.com> Acked-by: Hoang Le <hoang.h.le@dektech.com.au> Acked-by: Tung Nguyen <tung.q.nguyen@dektech.com.au> Acked-by: Xin Long <lucien.xin@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2021-03-17tipc: simplify signature of tipc_nametbl_lookup_group()Jon Maloy1-25/+17
We reduce the signature of tipc_nametbl_lookup_group() by using a struct tipc_uaddr pointer. This entails a couple of minor changes in the functions tipc_send_group_mcast/anycast/unicast/bcast() in socket.c Signed-off-by: Jon Maloy <jmaloy@redhat.com> Acked-by: Ying Xue <ying.xue@windriver.com> Acked-by: Hoang Le <hoang.h.le@dektech.com.au> Acked-by: Tung Nguyen <tung.q.nguyen@dektech.com.au> Acked-by: Xin Long <lucien.xin@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2021-03-17tipc: simplify signature of tipc_nametbl_lookup_mcast_nodes()Jon Maloy1-10/+8
We follow up the preceding commits by reducing the signature of the function tipc_nametbl_lookup_mcast_nodes(). Signed-off-by: Jon Maloy <jmaloy@redhat.com> Acked-by: Ying Xue <ying.xue@windriver.com> Acked-by: Hoang Le <hoang.h.le@dektech.com.au> Acked-by: Tung Nguyen <tung.q.nguyen@dektech.com.au> Acked-by: Xin Long <lucien.xin@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2021-03-17tipc: simplify signature of tipc_namtbl_lookup_mcast_sockets()Jon Maloy1-11/+11
We reduce the signature of this function according to the same principle as the preceding commits. Signed-off-by: Jon Maloy <jmaloy@redhat.com> Acked-by: Ying Xue <ying.xue@windriver.com> Acked-by: Hoang Le <hoang.h.le@dektech.com.au> Acked-by: Tung Nguyen <tung.q.nguyen@dektech.com.au> Acked-by: Xin Long <lucien.xin@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2021-03-17tipc: refactor tipc_sendmsg() and tipc_lookup_anycast()Jon Maloy1-43/+40
We simplify the signature if function tipc_nametbl_lookup_anycast(), using address structures instead of discrete integers. This also makes it possible to make some improvements to the functions __tipc_sendmsg() in socket.c and tipc_msg_lookup_dest() in msg.c. Signed-off-by: Jon Maloy <jmaloy@redhat.com> Acked-by: Ying Xue <ying.xue@windriver.com> Acked-by: Hoang Le <hoang.h.le@dektech.com.au> Acked-by: Tung Nguyen <tung.q.nguyen@dektech.com.au> Acked-by: Xin Long <lucien.xin@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2021-03-17tipc: rename binding table lookup functionsJon Maloy1-9/+10
The binding table provides four different lookup functions, which purpose is not obvious neither by their names nor by the (lack of) descriptions. We now give these functions names that better match their purposes, and improve the comments that describe what they are doing. Signed-off-by: Jon Maloy <jmaloy@redhat.com> Acked-by: Ying Xue <ying.xue@windriver.com> Acked-by: Hoang Le <hoang.h.le@dektech.com.au> Acked-by: Tung Nguyen <tung.q.nguyen@dektech.com.au> Acked-by: Xin Long <lucien.xin@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2021-03-17tipc: simplify signature of tipc_nametbl_withdraw() functionsJon Maloy1-31/+31
Following the principles of the preceding commits, we reduce the number of parameters passed along in tipc_sk_withdraw(), tipc_nametbl_withdraw() and associated functions. Signed-off-by: Jon Maloy <jmaloy@redhat.com> Acked-by: Ying Xue <ying.xue@windriver.com> Acked-by: Hoang Le <hoang.h.le@dektech.com.au> Acked-by: Tung Nguyen <tung.q.nguyen@dektech.com.au> Acked-by: Xin Long <lucien.xin@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2021-03-17tipc: simplify signature of tipc_namtbl_publish()Jon Maloy1-34/+39
Using the new address structure tipc_uaddr, we simplify the signature of function tipc_sk_publish() and tipc_namtbl_publish() so that fewer parameters need to be passed around. Signed-off-by: Jon Maloy <jmaloy@redhat.com> Acked-by: Ying Xue <ying.xue@windriver.com> Acked-by: Hoang Le <hoang.h.le@dektech.com.au> Acked-by: Tung Nguyen <tung.q.nguyen@dektech.com.au> Acked-by: Xin Long <lucien.xin@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2021-03-17tipc: re-organize members of struct publicationJon Maloy1-20/+20
In a future commit we will introduce more members to struct publication. In order to keep this structure comprehensible we now group some of its current fields into the sub-structures where they really belong, - A struct tipc_service_range for the functional address the publication is representing. - A struct tipc_socket_addr for the socket bound to that service range. We also rename the stack variable 'publ' to just 'p' in a few places. This is just as easy to understand in the given context, and keeps the number of wrapped code lines to a minimum. There are no functional changes in this commit. Signed-off-by: Jon Maloy <jmaloy@redhat.com> Acked-by: Ying Xue <ying.xue@windriver.com> Acked-by: Hoang Le <hoang.h.le@dektech.com.au> Acked-by: Tung Nguyen <tung.q.nguyen@dektech.com.au> Acked-by: Xin Long <lucien.xin@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-12-01net/tipc: fix all function Return: notationRandy Dunlap1-29/+28
Fix Return: kernel-doc notation in all net/tipc/ source files. Also keep ReST list notation intact for output formatting. Fix a few typos in comments. Signed-off-by: Randy Dunlap <rdunlap@infradead.org> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2020-12-01net/tipc: fix socket.c kernel-docRandy Dunlap1-2/+29
Fix socket.c kernel-doc warnings in preparation for adding to the networking docbook. Also, for rcvbuf_limit(), use bullet notation so that the lines do not run together. ../net/tipc/socket.c:130: warning: Function parameter or member 'cong_links' not described in 'tipc_sock' ../net/tipc/socket.c:130: warning: Function parameter or member 'probe_unacked' not described in 'tipc_sock' ../net/tipc/socket.c:130: warning: Function parameter or member 'snd_win' not described in 'tipc_sock' ../net/tipc/socket.c:130: warning: Function parameter or member 'peer_caps' not described in 'tipc_sock' ../net/tipc/socket.c:130: warning: Function parameter or member 'rcv_win' not described in 'tipc_sock' ../net/tipc/socket.c:130: warning: Function parameter or member 'group' not described in 'tipc_sock' ../net/tipc/socket.c:130: warning: Function parameter or member 'oneway' not described in 'tipc_sock' ../net/tipc/socket.c:130: warning: Function parameter or member 'nagle_start' not described in 'tipc_sock' ../net/tipc/socket.c:130: warning: Function parameter or member 'snd_backlog' not described in 'tipc_sock' ../net/tipc/socket.c:130: warning: Function parameter or member 'msg_acc' not described in 'tipc_sock' ../net/tipc/socket.c:130: warning: Function parameter or member 'pkt_cnt' not described in 'tipc_sock' ../net/tipc/socket.c:130: warning: Function parameter or member 'expect_ack' not described in 'tipc_sock' ../net/tipc/socket.c:130: warning: Function parameter or member 'nodelay' not described in 'tipc_sock' ../net/tipc/socket.c:130: warning: Function parameter or member 'group_is_open' not described in 'tipc_sock' ../net/tipc/socket.c:267: warning: Function parameter or member 'sk' not described in 'tsk_advance_rx_queue' ../net/tipc/socket.c:295: warning: Function parameter or member 'sk' not described in 'tsk_rej_rx_queue' ../net/tipc/socket.c:295: warning: Function parameter or member 'error' not described in 'tsk_rej_rx_queue' ../net/tipc/socket.c:894: warning: Function parameter or member 'tsk' not described in 'tipc_send_group_msg' ../net/tipc/socket.c:1187: warning: Function parameter or member 'net' not described in 'tipc_sk_mcast_rcv' ../net/tipc/socket.c:1323: warning: Function parameter or member 'inputq' not described in 'tipc_sk_conn_proto_rcv' ../net/tipc/socket.c:1323: warning: Function parameter or member 'xmitq' not described in 'tipc_sk_conn_proto_rcv' ../net/tipc/socket.c:1885: warning: Function parameter or member 'sock' not described in 'tipc_recvmsg' ../net/tipc/socket.c:1993: warning: Function parameter or member 'sock' not described in 'tipc_recvstream' ../net/tipc/socket.c:2313: warning: Function parameter or member 'xmitq' not described in 'tipc_sk_filter_rcv' ../net/tipc/socket.c:2404: warning: Function parameter or member 'xmitq' not described in 'tipc_sk_enqueue' ../net/tipc/socket.c:2456: warning: Function parameter or member 'net' not described in 'tipc_sk_rcv' ../net/tipc/socket.c:2693: warning: Function parameter or member 'kern' not described in 'tipc_accept' ../net/tipc/socket.c:3816: warning: Excess function parameter 'sysctl_tipc_sk_filter' description in 'tipc_sk_filtering' Signed-off-by: Randy Dunlap <rdunlap@infradead.org> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2020-12-01net/tipc: fix various kernel-doc warningsRandy Dunlap1-2/+2
kernel-doc and Sphinx fixes to eliminate lots of warnings in preparation for adding to the networking docbook. ../net/tipc/crypto.c:57: warning: cannot understand function prototype: 'enum ' ../net/tipc/crypto.c:69: warning: cannot understand function prototype: 'enum ' ../net/tipc/crypto.c:130: warning: Function parameter or member 'tfm' not described in 'tipc_tfm' ../net/tipc/crypto.c:130: warning: Function parameter or member 'list' not described in 'tipc_tfm' ../net/tipc/crypto.c:172: warning: Function parameter or member 'stat' not described in 'tipc_crypto_stats' ../net/tipc/crypto.c:232: warning: Function parameter or member 'flags' not described in 'tipc_crypto' ../net/tipc/crypto.c:329: warning: Function parameter or member 'ukey' not described in 'tipc_aead_key_validate' ../net/tipc/crypto.c:329: warning: Function parameter or member 'info' not described in 'tipc_aead_key_validate' ../net/tipc/crypto.c:482: warning: Function parameter or member 'aead' not described in 'tipc_aead_tfm_next' ../net/tipc/trace.c:43: warning: cannot understand function prototype: 'unsigned long sysctl_tipc_sk_filter[5] __read_mostly = ' Documentation/networking/tipc:57: ../net/tipc/msg.c:584: WARNING: Unexpected indentation. Documentation/networking/tipc:63: ../net/tipc/name_table.c:536: WARNING: Unexpected indentation. Documentation/networking/tipc:63: ../net/tipc/name_table.c:537: WARNING: Block quote ends without a blank line; unexpected unindent. Documentation/networking/tipc:78: ../net/tipc/socket.c:3809: WARNING: Unexpected indentation. Documentation/networking/tipc:78: ../net/tipc/socket.c:3807: WARNING: Inline strong start-string without end-string. Documentation/networking/tipc:72: ../net/tipc/node.c:904: WARNING: Unexpected indentation. Documentation/networking/tipc:39: ../net/tipc/crypto.c:97: WARNING: Block quote ends without a blank line; unexpected unindent. Documentation/networking/tipc:39: ../net/tipc/crypto.c:98: WARNING: Block quote ends without a blank line; unexpected unindent. Documentation/networking/tipc:39: ../net/tipc/crypto.c:141: WARNING: Inline strong start-string without end-string. ../net/tipc/discover.c:82: warning: Function parameter or member 'skb' not described in 'tipc_disc_init_msg' ../net/tipc/msg.c:69: warning: Function parameter or member 'gfp' not described in 'tipc_buf_acquire' ../net/tipc/msg.c:382: warning: Function parameter or member 'offset' not described in 'tipc_msg_build' ../net/tipc/msg.c:708: warning: Function parameter or member 'net' not described in 'tipc_msg_lookup_dest' ../net/tipc/subscr.c:65: warning: Function parameter or member 'seq' not described in 'tipc_sub_check_overlap' ../net/tipc/subscr.c:65: warning: Function parameter or member 'found_lower' not described in 'tipc_sub_check_overlap' ../net/tipc/subscr.c:65: warning: Function parameter or member 'found_upper' not described in 'tipc_sub_check_overlap' ../net/tipc/udp_media.c:75: warning: Function parameter or member 'proto' not described in 'udp_media_addr' ../net/tipc/udp_media.c:75: warning: Function parameter or member 'port' not described in 'udp_media_addr' ../net/tipc/udp_media.c:75: warning: Function parameter or member 'ipv4' not described in 'udp_media_addr' ../net/tipc/udp_media.c:75: warning: Function parameter or member 'ipv6' not described in 'udp_media_addr' ../net/tipc/udp_media.c:98: warning: Function parameter or member 'rcast' not described in 'udp_bearer' Also fixed a typo of "duest" to "dest". Signed-off-by: Randy Dunlap <rdunlap@infradead.org> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2020-11-27tipc: update address terminology in codeJon Maloy1-22/+22
We update the terminology in the code so that deprecated structure names and macros are replaced with those currently recommended in the user API. struct tipc_portid -> struct tipc_socket_addr struct tipc_name -> struct tipc_service_addr struct tipc_name_seq -> struct tipc_service_range TIPC_ADDR_ID -> TIPC_SOCKET_ADDR TIPC_ADDR_NAME -> TIPC_SERVICE_ADDR TIPC_ADDR_NAMESEQ -> TIPC_SERVICE_RANGE TIPC_CFG_SRV -> TIPC_NODE_STATE Acked-by: Ying Xue <ying.xue@windriver.com> Signed-off-by: Jon Maloy <jmaloy@redhat.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2020-11-27tipc: refactor tipc_sk_bind() functionJon Maloy1-36/+30
We refactor the tipc_sk_bind() function, so that the lock handling is handled separately from the logics. We also move some sanity tests to earlier in the call chain, to the function tipc_bind(). Acked-by: Ying Xue <ying.xue@windriver.com> Signed-off-by: Jon Maloy <jmaloy@redhat.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2020-10-30tipc: add stricter control of reserved service typesJon Maloy1-9/+18
TIPC reserves 64 service types for current and future internal use. Therefore, the bind() function is meant to block regular user sockets from being bound to these values, while it should let through such bindings from internal users. However, since we at the design moment saw no way to distinguish between regular and internal users the filter function ended up with allowing all bindings of the reserved types which were really in use ([0,1]), and block all the rest ([2,63]). This is risky, since a regular user may bind to the service type representing the topology server (TIPC_TOP_SRV == 1) or the one used for indicating neighboring node status (TIPC_CFG_SRV == 0), and wreak havoc for users of those services, i.e., most users. The reality is however that TIPC_CFG_SRV never is bound through the bind() function, since it doesn't represent a regular socket, and TIPC_TOP_SRV can also be made to bypass the checks in tipc_bind() by introducing a different entry function, tipc_sk_bind(). It should be noted that although this is a change of the API semantics, there is no risk we will break any currently working applications by doing this. Any application trying to bind to the values in question would be badly broken from the outset, so there is no chance we would find any such applications in real-world production systems. v2: Added warning printout when a user is blocked from binding, as suggested by Jakub Kicinski Acked-by: Yung Xue <ying.xue@windriver.com> Signed-off-by: Jon Maloy <jmaloy@redhat.com> Link: https://lore.kernel.org/r/20201030012938.489557-1-jmaloy@redhat.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2020-09-22Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/netDavid S. Miller1-4/+1
Two minor conflicts: 1) net/ipv4/route.c, adding a new local variable while moving another local variable and removing it's initial assignment. 2) drivers/net/dsa/microchip/ksz9477.c, overlapping changes. One pretty prints the port mode differently, whilst another changes the driver to try and obtain the port mode from the port node rather than the switch node. Signed-off-by: David S. Miller <davem@davemloft.net>
2020-09-18net: tipc: delete duplicated wordsRandy Dunlap1-1/+1
Drop repeated words in net/tipc/. Signed-off-by: Randy Dunlap <rdunlap@infradead.org> Cc: "David S. Miller" <davem@davemloft.net> Cc: Jakub Kicinski <kuba@kernel.org> Cc: Jon Maloy <jmaloy@redhat.com> Cc: Ying Xue <ying.xue@windriver.com> Cc: tipc-discussion@lists.sourceforge.net Signed-off-by: David S. Miller <davem@davemloft.net>
2020-09-10tipc: fix shutdown() of connection oriented socketTetsuo Handa1-4/+1
I confirmed that the problem fixed by commit 2a63866c8b51a3f7 ("tipc: fix shutdown() of connectionless socket") also applies to stream socket. ---------- #include <sys/socket.h> #include <unistd.h> #include <sys/wait.h> int main(int argc, char *argv[]) { int fds[2] = { -1, -1 }; socketpair(PF_TIPC, SOCK_STREAM /* or SOCK_DGRAM */, 0, fds); if (fork() == 0) _exit(read(fds[0], NULL, 1)); shutdown(fds[0], SHUT_RDWR); /* This must make read() return. */ wait(NULL); /* To be woken up by _exit(). */ return 0; } ---------- Since shutdown(SHUT_RDWR) should affect all processes sharing that socket, unconditionally setting sk->sk_shutdown to SHUTDOWN_MASK will be the right behavior. Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Acked-by: Ying Xue <ying.xue@windriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-09-04Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/netJakub Kicinski1-3/+6
We got slightly different patches removing a double word in a comment in net/ipv4/raw.c - picked the version from net. Simple conflict in drivers/net/ethernet/ibm/ibmvnic.c. Use cached values instead of VNIC login response buffer (following what commit 507ebe6444a4 ("ibmvnic: Fix use-after-free of VNIC login response buffer") did). Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2020-09-03Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/netLinus Torvalds1-3/+6
Pull networking fixes from David Miller: 1) Use netif_rx_ni() when necessary in batman-adv stack, from Jussi Kivilinna. 2) Fix loss of RTT samples in rxrpc, from David Howells. 3) Memory leak in hns_nic_dev_probe(), from Dignhao Liu. 4) ravb module cannot be unloaded, fix from Yuusuke Ashizuka. 5) We disable BH for too lokng in sctp_get_port_local(), add a cond_resched() here as well, from Xin Long. 6) Fix memory leak in st95hf_in_send_cmd, from Dinghao Liu. 7) Out of bound access in bpf_raw_tp_link_fill_link_info(), from Yonghong Song. 8) Missing of_node_put() in mt7530 DSA driver, from Sumera Priyadarsini. 9) Fix crash in bnxt_fw_reset_task(), from Michael Chan. 10) Fix geneve tunnel checksumming bug in hns3, from Yi Li. 11) Memory leak in rxkad_verify_response, from Dinghao Liu. 12) In tipc, don't use smp_processor_id() in preemptible context. From Tuong Lien. 13) Fix signedness issue in mlx4 memory allocation, from Shung-Hsi Yu. 14) Missing clk_disable_prepare() in gemini driver, from Dan Carpenter. 15) Fix ABI mismatch between driver and firmware in nfp, from Louis Peens. * git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net: (110 commits) net/smc: fix sock refcounting in case of termination net/smc: reset sndbuf_desc if freed net/smc: set rx_off for SMCR explicitly net/smc: fix toleration of fake add_link messages tg3: Fix soft lockup when tg3_reset_task() fails. doc: net: dsa: Fix typo in config code sample net: dp83867: Fix WoL SecureOn password nfp: flower: fix ABI mismatch between driver and firmware tipc: fix shutdown() of connectionless socket ipv6: Fix sysctl max for fib_multipath_hash_policy drivers/net/wan/hdlc: Change the default of hard_header_len to 0 net: gemini: Fix another missing clk_disable_unprepare() in probe net: bcmgenet: fix mask check in bcmgenet_validate_flow() amd-xgbe: Add support for new port mode net: usb: dm9601: Add USB ID of Keenetic Plus DSL vhost: fix typo in error message net: ethernet: mlx4: Fix memory allocation in mlx4_buddy_init() pktgen: fix error message with wrong function name net: ethernet: ti: am65-cpsw: fix rmii 100Mbit link mode cxgb4: fix thermal zone device registration ...
2020-09-02tipc: fix shutdown() of connectionless socketTetsuo Handa1-3/+6
syzbot is reporting hung task at nbd_ioctl() [1], for there are two problems regarding TIPC's connectionless socket's shutdown() operation. ---------- #include <fcntl.h> #include <sys/socket.h> #include <sys/ioctl.h> #include <linux/nbd.h> #include <unistd.h> int main(int argc, char *argv[]) { const int fd = open("/dev/nbd0", 3); alarm(5); ioctl(fd, NBD_SET_SOCK, socket(PF_TIPC, SOCK_DGRAM, 0)); ioctl(fd, NBD_DO_IT, 0); /* To be interrupted by SIGALRM. */ return 0; } ---------- One problem is that wait_for_completion() from flush_workqueue() from nbd_start_device_ioctl() from nbd_ioctl() cannot be completed when nbd_start_device_ioctl() received a signal at wait_event_interruptible(), for tipc_shutdown() from kernel_sock_shutdown(SHUT_RDWR) from nbd_mark_nsock_dead() from sock_shutdown() from nbd_start_device_ioctl() is failing to wake up a WQ thread sleeping at wait_woken() from tipc_wait_for_rcvmsg() from sock_recvmsg() from sock_xmit() from nbd_read_stat() from recv_work() scheduled by nbd_start_device() from nbd_start_device_ioctl(). Fix this problem by always invoking sk->sk_state_change() (like inet_shutdown() does) when tipc_shutdown() is called. The other problem is that tipc_wait_for_rcvmsg() cannot return when tipc_shutdown() is called, for tipc_shutdown() sets sk->sk_shutdown to SEND_SHUTDOWN (despite "how" is SHUT_RDWR) while tipc_wait_for_rcvmsg() needs sk->sk_shutdown set to RCV_SHUTDOWN or SHUTDOWN_MASK. Fix this problem by setting sk->sk_shutdown to SHUTDOWN_MASK (like inet_shutdown() does) when the socket is connectionless. [1] https://syzkaller.appspot.com/bug?id=3fe51d307c1f0a845485cf1798aa059d12bf18b2 Reported-by: syzbot <syzbot+e36f41d207137b5d12f7@syzkaller.appspotmail.com> Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-08-31tipc: Remove unused macro TIPC_FWD_MSGYueHaibing1-1/+0
There is no caller in tree any more. Signed-off-by: YueHaibing <yuehaibing@huawei.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-08-23treewide: Use fallthrough pseudo-keywordGustavo A. R. Silva1-2/+2
Replace the existing /* fall through */ comments and its variants with the new pseudo-keyword macro fallthrough[1]. Also, remove unnecessary fall-through markings when it is the case. [1] https://www.kernel.org/doc/html/v5.7/process/deprecated.html?highlight=fallthrough#implicit-switch-case-fall-through Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
2020-08-18net: tipc: Convert to use the preferred fallthrough macroMiaohe Lin1-2/+2
Convert the uses of fallthrough comments to fallthrough macro. Signed-off-by: Miaohe Lin <linmiaohe@huawei.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-07-24net: pass a sockptr_t into ->setsockoptChristoph Hellwig1-4/+4
Rework the remaining setsockopt code to pass a sockptr_t instead of a plain user pointer. This removes the last remaining set_fs(KERNEL_DS) outside of architecture specific code. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Stefan Schmidt <stefan@datenfreihafen.org> [ieee802154] Acked-by: Matthieu Baerts <matthieu.baerts@tessares.net> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-07-13net: tipc: kerneldoc fixesAndrew Lunn1-5/+3
Simple fixes which require no deep knowledge of the code. Cc: Jon Maloy <jmaloy@redhat.com> Cc: Ying Xue <ying.xue@windriver.com> Signed-off-by: Andrew Lunn <andrew@lunn.ch> Acked-by: Jon Maloy <jmaloy@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-06-11tipc: fix kernel WARNING in tipc_msg_append()Tuong Lien1-1/+2
syzbot found the following issue: WARNING: CPU: 0 PID: 6808 at include/linux/thread_info.h:150 check_copy_size include/linux/thread_info.h:150 [inline] WARNING: CPU: 0 PID: 6808 at include/linux/thread_info.h:150 copy_from_iter include/linux/uio.h:144 [inline] WARNING: CPU: 0 PID: 6808 at include/linux/thread_info.h:150 tipc_msg_append+0x49a/0x5e0 net/tipc/msg.c:242 Kernel panic - not syncing: panic_on_warn set ... This happens after commit 5e9eeccc58f3 ("tipc: fix NULL pointer dereference in streaming") that tried to build at least one buffer even when the message data length is zero... However, it now exposes another bug that the 'mss' can be zero and the 'cpy' will be negative, thus the above kernel WARNING will appear! The zero value of 'mss' is never expected because it means Nagle is not enabled for the socket (actually the socket type was 'SOCK_SEQPACKET'), so the function 'tipc_msg_append()' must not be called at all. But that was in this particular case since the message data length was zero, and the 'send <= maxnagle' check became true. We resolve the issue by explicitly checking if Nagle is enabled for the socket, i.e. 'maxnagle != 0' before calling the 'tipc_msg_append()'. We also reinforce the function to against such a negative values if any. Reported-by: syzbot+75139a7d2605236b0b7f@syzkaller.appspotmail.com Fixes: c0bceb97db9e ("tipc: add smart nagle feature") Acked-by: Jon Maloy <jmaloy@redhat.com> Signed-off-by: Tuong Lien <tuong.t.lien@dektech.com.au> Signed-off-by: David S. Miller <davem@davemloft.net>
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