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2020-08-23treewide: Use fallthrough pseudo-keywordGustavo A. R. Silva2-11/+11
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>
2020-08-15can: j1939: add rxtimer for multipacket broadcast sessionZhang Changzhong1-8/+20
According to SAE J1939/21 (Chapter 5.12.3 and APPENDIX C), for transmit side the required time interval between packets of a multipacket broadcast message is 50 to 200 ms, the responder shall use a timeout of 250ms (provides margin allowing for the maximumm spacing of 200ms). For receive side a timeout will occur when a time of greater than 750 ms elapsed between two message packets when more packets were expected. So this patch fix and add rxtimer for multipacket broadcast session. Fixes: 9d71dd0c7009 ("can: add support of SAE J1939 protocol") Signed-off-by: Zhang Changzhong <zhangchangzhong@huawei.com> Link: https://lore.kernel.org/r/1596599425-5534-5-git-send-email-zhangchangzhong@huawei.com Acked-by: Oleksij Rempel <o.rempel@pengutronix.de> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
2020-08-15can: j1939: abort multipacket broadcast session when timeout occursZhang Changzhong1-1/+1
If timeout occurs, j1939_tp_rxtimer() first calls hrtimer_start() to restart rxtimer, and then calls __j1939_session_cancel() to set session->state = J1939_SESSION_WAITING_ABORT. At next timeout expiration, because of the J1939_SESSION_WAITING_ABORT session state j1939_tp_rxtimer() will call j1939_session_deactivate_activate_next() to deactivate current session, and rxtimer won't be set. But for multipacket broadcast session, __j1939_session_cancel() don't set session->state = J1939_SESSION_WAITING_ABORT, thus current session won't be deactivate and hrtimer_start() is called to start new rxtimer again and again. So fix it by moving session->state = J1939_SESSION_WAITING_ABORT out of if (!j1939_cb_is_broadcast(&session->skcb)) statement. Fixes: 9d71dd0c7009 ("can: add support of SAE J1939 protocol") Signed-off-by: Zhang Changzhong <zhangchangzhong@huawei.com> Link: https://lore.kernel.org/r/1596599425-5534-4-git-send-email-zhangchangzhong@huawei.com Acked-by: Oleksij Rempel <o.rempel@pengutronix.de> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
2020-08-15can: j1939: cancel rxtimer on multipacket broadcast session completeZhang Changzhong1-0/+1
If j1939_xtp_rx_dat_one() receive last frame of multipacket broadcast message, j1939_session_timers_cancel() should be called to cancel rxtimer. Fixes: 9d71dd0c7009 ("can: add support of SAE J1939 protocol") Signed-off-by: Zhang Changzhong <zhangchangzhong@huawei.com> Link: https://lore.kernel.org/r/1596599425-5534-3-git-send-email-zhangchangzhong@huawei.com Acked-by: Oleksij Rempel <o.rempel@pengutronix.de> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
2020-08-15can: j1939: fix support for multipacket broadcast messageZhang Changzhong1-3/+14
Currently j1939_tp_im_involved_anydir() in j1939_tp_recv() check the previously set flags J1939_ECU_LOCAL_DST and J1939_ECU_LOCAL_SRC of incoming skb, thus multipacket broadcast message was aborted by receive side because it may come from remote ECUs and have no exact dst address. Similarly, j1939_tp_cmd_recv() and j1939_xtp_rx_dat() didn't process broadcast message. So fix it by checking and process broadcast message in j1939_tp_recv(), j1939_tp_cmd_recv() and j1939_xtp_rx_dat(). Fixes: 9d71dd0c7009 ("can: add support of SAE J1939 protocol") Signed-off-by: Zhang Changzhong <zhangchangzhong@huawei.com> Link: https://lore.kernel.org/r/1596599425-5534-2-git-send-email-zhangchangzhong@huawei.com Acked-by: Oleksij Rempel <o.rempel@pengutronix.de> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
2020-08-14can: j1939: transport: j1939_xtp_rx_dat_one(): compare own packets to detect corruptionsOleksij Rempel1-1/+14
Since the stack relays on receiving own packets, it was overwriting own transmit buffer from received packets. At least theoretically, the received echo buffer can be corrupt or changed and the session partner can request to resend previous data. In this case we will re-send bad data. With this patch we will stop to overwrite own TX buffer and use it for sanity checking. Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de> Link: https://lore.kernel.org/r/20200807105200.26441-6-o.rempel@pengutronix.de Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
2020-08-14can: j1939: transport: add j1939_session_skb_find_by_offset() functionOleksij Rempel1-7/+15
Sometimes it makes no sense to search the skb by pkt.dpo, since we need next the skb within the transaction block. This may happen if we have an ETP session with CTS set to less than 255 packets. After this patch, we will be able to work with ETP sessions where the block size (ETP.CM_CTS byte 2) is less than 255 packets. Reported-by: Henrique Figueira <henrislip@gmail.com> Reported-by: https://github.com/linux-can/can-utils/issues/228 Fixes: 9d71dd0c7009 ("can: add support of SAE J1939 protocol") Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de> Link: https://lore.kernel.org/r/20200807105200.26441-5-o.rempel@pengutronix.de Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
2020-08-14can: j1939: socket: j1939_sk_bind(): make sure ml_priv is allocatedOleksij Rempel1-0/+8
This patch adds check to ensure that the struct net_device::ml_priv is allocated, as it is used later by the j1939 stack. The allocation is done by all mainline CAN network drivers, but when using bond or team devices this is not the case. Bail out if no ml_priv is allocated. Reported-by: syzbot+f03d384f3455d28833eb@syzkaller.appspotmail.com Fixes: 9d71dd0c7009 ("can: add support of SAE J1939 protocol") Cc: linux-stable <stable@vger.kernel.org> # >= v5.4 Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de> Link: https://lore.kernel.org/r/20200807105200.26441-4-o.rempel@pengutronix.de Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
2020-08-14can: j1939: transport: j1939_session_tx_dat(): fix use-after-free read in j1939_tp_txtimer()Oleksij Rempel1-0/+15
The current stack implementation do not support ECTS requests of not aligned TP sized blocks. If ECTS will request a block with size and offset spanning two TP blocks, this will cause memcpy() to read beyond the queued skb (which does only contain one TP sized block). Sometimes KASAN will detect this read if the memory region beyond the skb was previously allocated and freed. In other situations it will stay undetected. The ETP transfer in any case will be corrupted. This patch adds a sanity check to avoid this kind of read and abort the session with error J1939_XTP_ABORT_ECTS_TOO_BIG. Reported-by: syzbot+5322482fe520b02aea30@syzkaller.appspotmail.com Fixes: 9d71dd0c7009 ("can: add support of SAE J1939 protocol") Cc: linux-stable <stable@vger.kernel.org> # >= v5.4 Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de> Link: https://lore.kernel.org/r/20200807105200.26441-3-o.rempel@pengutronix.de Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
2020-08-14can: j1939: transport: j1939_simple_recv(): ignore local J1939 messages send not by J1939 stackOleksij Rempel2-0/+5
In current J1939 stack implementation, we process all locally send messages as own messages. Even if it was send by CAN_RAW socket. To reproduce it use following commands: testj1939 -P -r can0:0x80 & cansend can0 18238040#0123 This step will trigger false positive not critical warning: j1939_simple_recv: Received already invalidated message With this patch we add additional check to make sure, related skb is own echo message. Fixes: 9d71dd0c7009 ("can: add support of SAE J1939 protocol") Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de> Link: https://lore.kernel.org/r/20200807105200.26441-2-o.rempel@pengutronix.de Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
2020-08-14can: j1939: fix kernel-infoleak in j1939_sk_sock2sockaddr_can()Eric Dumazet1-0/+5
syzbot found that at least 2 bytes of kernel information were leaked during getsockname() on AF_CAN CAN_J1939 socket. Since struct sockaddr_can has in fact two holes, simply clear the whole area before filling it with useful data. BUG: KMSAN: kernel-infoleak in kmsan_copy_to_user+0x81/0x90 mm/kmsan/kmsan_hooks.c:253 CPU: 0 PID: 8466 Comm: syz-executor511 Not tainted 5.8.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x21c/0x280 lib/dump_stack.c:118 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:121 kmsan_internal_check_memory+0x238/0x3d0 mm/kmsan/kmsan.c:423 kmsan_copy_to_user+0x81/0x90 mm/kmsan/kmsan_hooks.c:253 instrument_copy_to_user include/linux/instrumented.h:91 [inline] _copy_to_user+0x18e/0x260 lib/usercopy.c:39 copy_to_user include/linux/uaccess.h:186 [inline] move_addr_to_user+0x3de/0x670 net/socket.c:237 __sys_getsockname+0x407/0x5e0 net/socket.c:1909 __do_sys_getsockname net/socket.c:1920 [inline] __se_sys_getsockname+0x91/0xb0 net/socket.c:1917 __x64_sys_getsockname+0x4a/0x70 net/socket.c:1917 do_syscall_64+0xad/0x160 arch/x86/entry/common.c:386 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x440219 Code: Bad RIP value. RSP: 002b:00007ffe5ee150c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000033 RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440219 RDX: 0000000020000240 RSI: 0000000020000100 RDI: 0000000000000003 RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401a20 R13: 0000000000401ab0 R14: 0000000000000000 R15: 0000000000000000 Local variable ----address@__sys_getsockname created at: __sys_getsockname+0x91/0x5e0 net/socket.c:1894 __sys_getsockname+0x91/0x5e0 net/socket.c:1894 Bytes 2-3 of 24 are uninitialized Memory access of size 24 starts at ffff8880ba2c7de8 Data copied to user address 0000000020000100 Fixes: 9d71dd0c7009 ("can: add support of SAE J1939 protocol") Signed-off-by: Eric Dumazet <edumazet@google.com> Reported-by: syzbot <syzkaller@googlegroups.com> Cc: Robin van der Gracht <robin@protonic.nl> Cc: Oleksij Rempel <o.rempel@pengutronix.de> Cc: Pengutronix Kernel Team <kernel@pengutronix.de> Cc: linux-can@vger.kernel.org Acked-by: Oleksij Rempel <o.rempel@pengutronix.de> Link: https://lore.kernel.org/r/20200813161834.4021638-1-edumazet@google.com Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
2020-07-24net: pass a sockptr_t into ->setsockoptChristoph Hellwig2-14/+14
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>
2020-07-19net: make ->{get,set}sockopt in proto_ops optionalChristoph Hellwig1-2/+0
Just check for a NULL method instead of wiring up sock_no_{get,set}sockopt. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Marc Kleine-Budde <mkl@pengutronix.de> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-07-13net: can: kerneldoc fixesAndrew Lunn1-0/+2
Simple fixes which require no deep knowledge of the code. Cc: Oliver Hartkopp <socketcan@hartkopp.net> Cc: Marc Kleine-Budde <mkl@pengutronix.de> Signed-off-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-06-14treewide: replace '---help---' in Kconfig files with 'help'Masahiro Yamada1-4/+4
Since commit 84af7a6194e4 ("checkpatch: kconfig: prefer 'help' over '---help---'"), the number of '---help---' has been gradually decreasing, but there are still more than 2400 instances. This commit finishes the conversion. While I touched the lines, I also fixed the indentation. There are a variety of indentation styles found. a) 4 spaces + '---help---' b) 7 spaces + '---help---' c) 8 spaces + '---help---' d) 1 space + 1 tab + '---help---' e) 1 tab + '---help---' (correct indentation) f) 1 tab + 1 space + '---help---' g) 1 tab + 2 spaces + '---help---' In order to convert all of them to 1 tab + 'help', I ran the following commend: $ find . -name 'Kconfig*' | xargs sed -i 's/^[[:space:]]*---help---/\thelp/' Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
2019-12-08can: j1939: j1939_sk_bind(): take priv after lock is heldOleksij Rempel1-3/+7
syzbot reproduced following crash: =============================================================================== kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 9844 Comm: syz-executor.0 Not tainted 5.4.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__lock_acquire+0x1254/0x4a00 kernel/locking/lockdep.c:3828 Code: 00 0f 85 96 24 00 00 48 81 c4 f0 00 00 00 5b 41 5c 41 5d 41 5e 41 5f 5d c3 48 b8 00 00 00 00 00 fc ff df 4c 89 f2 48 c1 ea 03 <80> 3c 02 00 0f 85 0b 28 00 00 49 81 3e 20 19 78 8a 0f 84 5f ee ff RSP: 0018:ffff888099c3fb48 EFLAGS: 00010006 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000218 RSI: 0000000000000000 RDI: 0000000000000001 RBP: ffff888099c3fc60 R08: 0000000000000001 R09: 0000000000000001 R10: fffffbfff146e1d0 R11: ffff888098720400 R12: 00000000000010c0 R13: 0000000000000000 R14: 00000000000010c0 R15: 0000000000000000 FS: 00007f0559e98700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fe4d89e0000 CR3: 0000000099606000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x190/0x410 kernel/locking/lockdep.c:4485 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline] _raw_spin_lock_bh+0x33/0x50 kernel/locking/spinlock.c:175 spin_lock_bh include/linux/spinlock.h:343 [inline] j1939_jsk_del+0x32/0x210 net/can/j1939/socket.c:89 j1939_sk_bind+0x2ea/0x8f0 net/can/j1939/socket.c:448 __sys_bind+0x239/0x290 net/socket.c:1648 __do_sys_bind net/socket.c:1659 [inline] __se_sys_bind net/socket.c:1657 [inline] __x64_sys_bind+0x73/0xb0 net/socket.c:1657 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a679 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f0559e97c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000031 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a679 RDX: 0000000000000018 RSI: 0000000020000240 RDI: 0000000000000003 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f0559e986d4 R13: 00000000004c09e9 R14: 00000000004d37d0 R15: 00000000ffffffff Modules linked in: ------------[ cut here ]------------ WARNING: CPU: 0 PID: 9844 at kernel/locking/mutex.c:1419 mutex_trylock+0x279/0x2f0 kernel/locking/mutex.c:1427 =============================================================================== This issues was caused by null pointer deference. Where j1939_sk_bind() was using currently not existing priv. Possible scenario may look as following: cpu0 cpu1 bind() bind() j1939_sk_bind() j1939_sk_bind() priv = jsk->priv; priv = jsk->priv; lock_sock(sock->sk); priv = j1939_netdev_start(ndev); j1939_jsk_add(priv, jsk); jsk->priv = priv; relase_sock(sock->sk); lock_sock(sock->sk); j1939_jsk_del(priv, jsk); ..... ooops ...... With this patch we move "priv = jsk->priv;" after the lock, to avoid assigning of wrong priv pointer. Reported-by: syzbot+99e9e1b200a1e363237d@syzkaller.appspotmail.com Fixes: 9d71dd0c7009 ("can: add support of SAE J1939 protocol") Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de> Cc: linux-stable <stable@vger.kernel.org> # >= v5.4 Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
2019-11-13can: j1939: warn if resources are still linked on destroyOleksij Rempel2-0/+7
j1939_session_destroy() and __j1939_priv_release() should be called only if session, ecu or socket are not linked or used by any one else. If at least one of these resources is linked, then the reference counting is broken somewhere. This warning will be triggered before KASAN will do, and will make it easier to debug initial issue. This works on platforms without KASAN support. Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
2019-11-13can: j1939: j1939_can_recv(): add priv refcountingOleksij Rempel1-0/+2
j1939_can_recv() can be called in parallel with socket release. In this case sk_release and sk_destruct can be done earlier than j1939_can_recv() is processed. Reported-by: syzbot+ca172a0ac477ac90f045@syzkaller.appspotmail.com Reported-by: syzbot+07ca5bce8530070a5650@syzkaller.appspotmail.com Reported-by: syzbot+a47537d3964ef6c874e1@syzkaller.appspotmail.com Fixes: 9d71dd0c7009 ("can: add support of SAE J1939 protocol") Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
2019-11-13can: j1939: transport: j1939_cancel_active_session(): use hrtimer_try_to_cancel() instead of hrtimer_cancel()Oleksij Rempel1-1/+5
This part of the code protected by lock used in the hrtimer as well. Using hrtimer_cancel() will trigger dead lock. Fixes: 9d71dd0c7009 ("can: add support of SAE J1939 protocol") Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
2019-11-13can: j1939: make sure socket is held as long as session existsOleksij Rempel1-0/+2
We link the socket to the session to be able provide socket specific notifications. For example messages over error queue. We need to keep the socket held, while we have a reference to it. Fixes: 9d71dd0c7009 ("can: add support of SAE J1939 protocol") Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
2019-11-13can: j1939: transport: make sure the aborted session will be deactivated only onceOleksij Rempel1-8/+17
j1939_session_cancel() was modifying session->state without protecting it by locks and without checking actual state of the session. This patch moves j1939_tp_set_rxtimeout() into j1939_session_cancel() and adds the missing locking. Fixes: 9d71dd0c7009 ("can: add support of SAE J1939 protocol") Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
2019-11-13can: j1939: socket: rework socket locking for j1939_sk_release() and j1939_sk_sendmsg()Oleksij Rempel1-18/+39
j1939_sk_sendmsg() should be protected by lock_sock() to avoid race with j1939_sk_bind() and j1939_sk_release(). Reported-by: syzbot+afd421337a736d6c1ee6@syzkaller.appspotmail.com Reported-by: syzbot+6d04f6a1b31a0ae12ca9@syzkaller.appspotmail.com Fixes: 9d71dd0c7009 ("can: add support of SAE J1939 protocol") Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
2019-11-13can: j1939: main: j1939_ndev_to_priv(): avoid crash if can_ml_priv is NULLOleksij Rempel1-0/+3
This patch avoids a NULL pointer deref crash if ndev->ml_priv is NULL. Reported-by: syzbot+95c8e0d9dffde15b6c5c@syzkaller.appspotmail.com Fixes: 9d71dd0c7009 ("can: add support of SAE J1939 protocol") Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
2019-11-13can: j1939: move j1939_priv_put() into sk_destruct callbackOleksij Rempel1-2/+35
This patch delays the j1939_priv_put() until the socket is destroyed via the sk_destruct callback, to avoid use-after-free problems. Fixes: 9d71dd0c7009 ("can: add support of SAE J1939 protocol") Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
2019-11-13can: af_can: export can_sock_destruct()Oleksij Rempel1-1/+2
In j1939 we need our own struct sock::sk_destruct callback. Export the generic af_can can_sock_destruct() that allows us to chain-call it. Fixes: 9d71dd0c7009 ("can: add support of SAE J1939 protocol") Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
2019-11-04can: j1939: transport: j1939_xtp_rx_eoma_one(): Add sanity check for correct total message sizeOleksij Rempel1-0/+18
We were sending malformed EOMA with total message size set to 0. This issue has been fixed in the previous patch. In this patch a sanity check is added to the RX path and a error message is displayed. Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
2019-11-04can: j1939: transport: j1939_session_fresh_new(): make sure EOMA is send with the total message size setOleksij Rempel1-1/+1
We were sending malformed EOMA messageswith total message size set to 0. This patch fixes the bug. Reported-by: https://github.com/linux-can/can-utils/issues/159 Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de> Acked-by: Kurt Van Dijck <dev.kurt@vandijck-laurijssen.be> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
2019-11-04can: j1939: fix memory leak if filters was setOleksij Rempel1-0/+1
Filters array is coped from user space and linked to the j1939 socket. On socket release this memory was not freed. Fixes: 9d71dd0c7009 ("can: add support of SAE J1939 protocol") Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
2019-11-04can: j1939: fix resource leak of skb on error return pathsColin Ian King1-2/+6
Currently the error return paths do not free skb and this results in a memory leak. Fix this by freeing them before the return. Addresses-Coverity: ("Resource leak") Fixes: 9d71dd0c7009 ("can: add support of SAE J1939 protocol") Signed-off-by: Colin Ian King <colin.king@canonical.com> Acked-by: Oleksij Rempel <o.rempel@pengutronix.de> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
2019-09-04can: add support of SAE J1939 protocolThe j1939 authors10-0/+4520
SAE J1939 is the vehicle bus recommended practice used for communication and diagnostics among vehicle components. Originating in the car and heavy-duty truck industry in the United States, it is now widely used in other parts of the world. J1939, ISO 11783 and NMEA 2000 all share the same high level protocol. SAE J1939 can be considered the replacement for the older SAE J1708 and SAE J1587 specifications. Acked-by: Oliver Hartkopp <socketcan@hartkopp.net> Signed-off-by: Bastian Stender <bst@pengutronix.de> Signed-off-by: Elenita Hinds <ecathinds@gmail.com> Signed-off-by: kbuild test robot <lkp@intel.com> Signed-off-by: Kurt Van Dijck <dev.kurt@vandijck-laurijssen.be> Signed-off-by: Maxime Jayat <maxime.jayat@mobile-devices.fr> Signed-off-by: Robin van der Gracht <robin@protonic.nl> Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
2019-09-04can: introduce CAN_REQUIRED_SIZE macroKurt Van Dijck2-4/+4
The size of this structure will be increased with J1939 support. To stay binary compatible, the CAN_REQUIRED_SIZE macro is introduced for existing CAN protocols. Signed-off-by: Kurt Van Dijck <dev.kurt@vandijck-laurijssen.be> Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de> Acked-by: Oliver Hartkopp <socketcan@hartkopp.net> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
2019-09-04can: af_can: use spin_lock_bh() for &net->can.rcvlists_lockOleksij Rempel1-4/+4
The can_rx_unregister() can be called from NAPI (soft IRQ) context, at least by j1939 stack. This leads to potential dead lock with &net->can.rcvlists_lock called from can_rx_register: =============================================================================== WARNING: inconsistent lock state 4.19.0-20181029-1-g3e67f95ba0d3 #3 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. testj1939/224 [HC0[0]:SC1[1]:HE1:SE0] takes: 1ad0fda3 (&(&net->can.rcvlists_lock)->rlock){+.?.}, at: can_rx_unregister+0x4c/0x1ac {SOFTIRQ-ON-W} state was registered at: lock_acquire+0xd0/0x1f4 _raw_spin_lock+0x30/0x40 can_rx_register+0x5c/0x14c j1939_netdev_start+0xdc/0x1f8 j1939_sk_bind+0x18c/0x1c8 __sys_bind+0x70/0xb0 sys_bind+0x10/0x14 ret_fast_syscall+0x0/0x28 0xbedc9b64 irq event stamp: 2440 hardirqs last enabled at (2440): [<c01302c0>] __local_bh_enable_ip+0xac/0x184 hardirqs last disabled at (2439): [<c0130274>] __local_bh_enable_ip+0x60/0x184 softirqs last enabled at (2412): [<c08b0bf4>] release_sock+0x84/0xa4 softirqs last disabled at (2415): [<c013055c>] irq_exit+0x100/0x1b0 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&(&net->can.rcvlists_lock)->rlock); <Interrupt> lock(&(&net->can.rcvlists_lock)->rlock); *** DEADLOCK *** 2 locks held by testj1939/224: #0: 168eb13b (rcu_read_lock){....}, at: netif_receive_skb_internal+0x3c/0x350 #1: 168eb13b (rcu_read_lock){....}, at: can_receive+0x88/0x1c0 =============================================================================== To avoid this situation, we should use spin_lock_bh() instead of spin_lock(). Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de> Acked-by: Oliver Hartkopp <socketcan@hartkopp.net> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
2019-09-04can: af_can: remove NULL-ptr checks from users of can_dev_rcv_lists_find()Marc Kleine-Budde1-29/+16
Since using the "struct can_ml_priv" for the per device "struct dev_rcv_lists" the call can_dev_rcv_lists_find() cannot fail anymore. This patch simplifies af_can by removing the NULL pointer checks from the dev_rcv_lists returned by can_dev_rcv_lists_find(). Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de> Acked-by: Oliver Hartkopp <socketcan@hartkopp.net> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
2019-09-04can: make use of preallocated can_ml_priv for per device struct can_dev_rcv_listsMarc Kleine-Budde1-38/+7
This patch removes the old method of allocating the per device protocol specific memory via a netdevice_notifier. This had the drawback, that the allocation can fail, leading to a lot of null pointer checks in the code. This also makes the live cycle management of this memory quite complicated. This patch switches from the allocating the struct can_dev_rcv_lists in a NETDEV_REGISTER call to using the dev->ml_priv, which is allocated by the driver since the previous patch. Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de> Acked-by: Oliver Hartkopp <socketcan@hartkopp.net> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
2019-09-04can: introduce CAN midlayer private and allocate it automaticallyMarc Kleine-Budde3-15/+2
This patch introduces the CAN midlayer private structure ("struct can_ml_priv") which should be used to hold protocol specific per device data structures. For now it's only member is "struct can_dev_rcv_lists". The CAN midlayer private is allocated via alloc_netdev()'s private and assigned to "struct net_device::ml_priv" during device creation. This is done transparently for CAN drivers using alloc_candev(). The slcan, vcan and vxcan drivers which are not using alloc_candev() have been adopted manually. The memory layout of the netdev_priv allocated via alloc_candev() will looke like this: +-------------------------+ | driver's priv | +-------------------------+ | struct can_ml_priv | +-------------------------+ | array of struct sk_buff | +-------------------------+ Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de> Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
2019-09-04can: af_can: can_pernet_exit(): no need to iterate over and cleanup registered CAN devicesMarc Kleine-Budde1-15/+0
The networking core takes care and unregisters every network device in a namespace before calling the can_pernet_exit() hook. This patch removes the unneeded cleanup. Acked-by: Oliver Hartkopp <socketcan@hartkopp.net> Suggested-by: Kirill Tkhai <ktkhai@virtuozzo.com> Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
2019-09-04can: af_can: can_rx_register(): use max() instead of open coding itMarc Kleine-Budde1-2/+2
This patch replaces an open coded max by the proper kernel define max(). Acked-by: Oliver Hartkopp <socketcan@hartkopp.net> Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
2019-09-04can: af_can: give variable holding the CAN receiver and the receiver list a sensible nameMarc Kleine-Budde1-51/+50
This patch gives the variables holding the CAN receiver and the receiver list a better name by renaming them from "r to "rcv" and "rl" to "recv_list". Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de> Acked-by: Oliver Hartkopp <socketcan@hartkopp.net> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
2019-09-04can: af_can: rename find_dev_rcv_lists() to can_dev_rcv_lists_find()Marc Kleine-Budde1-5/+5
This patch add the commonly used prefix "can_" to the find_dev_rcv_lists() function and moves the "find" to the end, as the function returns a struct can_dev_rcv_list. This improves the overall readability of the code. Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de> Acked-by: Oliver Hartkopp <socketcan@hartkopp.net> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
2019-09-04can: af_can: rename find_rcv_list() to can_rcv_list_find()Marc Kleine-Budde1-5/+5
This patch add the commonly used prefix "can_" to the find_rcv_list() function and add the "find" to the end, as the function returns a struct rcv_list. This improves the overall readability of the code. Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de> Acked-by: Oliver Hartkopp <socketcan@hartkopp.net> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
2019-09-04can: proc: give variable holding the CAN per device receive lists a sensible nameMarc Kleine-Budde1-18/+20
This patch gives the variables holding the CAN per device receive filter lists a better name by renaming them from "d" to "dev_rcv_lists". Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de> Acked-by: Oliver Hartkopp <socketcan@hartkopp.net> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
2019-09-04can: af_can: give variable holding the CAN per device receive lists a sensible nameMarc Kleine-Budde1-45/+44
This patch gives the variables holding the CAN receive filter lists a better name by renaming them from "d" to "dev_rcv_lists". Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de> Acked-by: Oliver Hartkopp <socketcan@hartkopp.net> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
2019-09-04can: netns: remove "can_" prefix from members struct netns_canMarc Kleine-Budde2-24/+24
This patch improves the code reability by removing the redundant "can_" prefix from the members of struct netns_can (as the struct netns_can itself is the member "can" of the struct net.) The conversion is done with: sed -i \ -e "s/struct can_dev_rcv_lists \*can_rx_alldev_list;/struct can_dev_rcv_lists *rx_alldev_list;/" \ -e "s/spinlock_t can_rcvlists_lock;/spinlock_t rcvlists_lock;/" \ -e "s/struct timer_list can_stattimer;/struct timer_list stattimer; /" \ -e "s/can\.can_rx_alldev_list/can.rx_alldev_list/g" \ -e "s/can\.can_rcvlists_lock/can.rcvlists_lock/g" \ -e "s/can\.can_stattimer/can.stattimer/g" \ include/net/netns/can.h \ net/can/*.[ch] Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de> Acked-by: Oliver Hartkopp <socketcan@hartkopp.net> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
2019-09-04can: proc: give variables holding CAN statistics a sensible nameMarc Kleine-Budde1-58/+58
This patch rename the variables holding the CAN statistics (can_stats and can_pstats) to pkg_stats and rcv_lists_stats which reflect better their meaning. The conversion is done with: sed -i \ -e "s/can_stats\([^_]\)/pkg_stats\1/g" \ -e "s/can_pstats/rcv_lists_stats/g" \ net/can/proc.c Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de> Acked-by: Oliver Hartkopp <socketcan@hartkopp.net> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
2019-09-04can: af_can: give variables holding CAN statistics a sensible nameMarc Kleine-Budde1-15/+15
This patch rename the variables holding the CAN statistics (can_stats and can_pstats) to pkg_stats and rcv_lists_stats which reflect better their meaning. The conversion is done with: sed -i \ -e "s/can_stats\([^_]\)/pkg_stats\1/g" \ -e "s/can_pstats/rcv_lists_stats/g" \ net/can/af_can.c Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de> Acked-by: Oliver Hartkopp <socketcan@hartkopp.net> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
2019-09-04can: netns: give members of struct netns_can holding the statistics a sensible nameMarc Kleine-Budde2-23/+23
This patch gives the members of the struct netns_can that are holding the statistics a sensible name, by renaming struct netns_can::can_stats into struct netns_can::pkg_stats and struct netns_can::can_pstats into struct netns_can::rcv_lists_stats. The conversion is done with: sed -i \ -e "s:\(struct[^*]*\*\)can_stats;.*:\1pkg_stats;:" \ -e "s:\(struct[^*]*\*\)can_pstats;.*:\1rcv_lists_stats;:" \ -e "s/can\.can_stats/can.pkg_stats/g" \ -e "s/can\.can_pstats/can.rcv_lists_stats/g" \ net/can/*.[ch] \ include/net/netns/can.h Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de> Acked-by: Oliver Hartkopp <socketcan@hartkopp.net> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
2019-09-04can: netns: give structs holding the CAN statistics a sensible nameMarc Kleine-Budde3-14/+14
This patch renames both "struct s_stats" and "struct s_pstats", to "struct can_pkg_stats" and "struct can_rcv_lists_stats" to better reflect their meaning and improve code readability. The conversion is done with: sed -i \ -e "s/struct s_stats/struct can_pkg_stats/g" \ -e "s/struct s_pstats/struct can_rcv_lists_stats/g" \ net/can/*.[ch] \ include/net/netns/can.h Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de> Acked-by: Oliver Hartkopp <socketcan@hartkopp.net> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
2019-08-13can: gw: add support for CAN FD framesOliver Hartkopp1-27/+187
Introduce CAN FD support which needs an extension of the netlink API to pass CAN FD type content to the kernel which has a different size to Classic CAN. Additionally the struct canfd_frame has a new 'flags' element that can now be modified with can-gw. The new CGW_FLAGS_CAN_FD option flag defines whether the routing job handles Classic CAN or CAN FD frames. This setting is very strict at reception time and enables the new possibilities, e.g. CGW_FDMOD_* and modifying the flags element of struct canfd_frame, only when CGW_FLAGS_CAN_FD is set. Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
2019-08-13can: gw: use struct canfd_frame as internal data structureOliver Hartkopp1-105/+117
To prepare the CAN FD support this patch implements the first adaptions in data structures for CAN FD without changing the current functionality. Additionally some code at the end of this patch is moved or indented to simplify the review of the next implementation step. Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
2019-08-13can: gw: cgw_parse_attr(): remove unnecessary braces for single statement blockMarc Kleine-Budde1-2/+1
This patch removes some unnecessary braces for a single statement block. Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
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