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2022-04-13nfc: nci: add flush_workqueue to prevent uafLin Ma1-0/+4
Our detector found a concurrent use-after-free bug when detaching an NCI device. The main reason for this bug is the unexpected scheduling between the used delayed mechanism (timer and workqueue). The race can be demonstrated below: Thread-1 Thread-2 | nci_dev_up() | nci_open_device() | __nci_request(nci_reset_req) | nci_send_cmd | queue_work(cmd_work) nci_unregister_device() | nci_close_device() | ... del_timer_sync(cmd_timer)[1] | ... | Worker nci_free_device() | nci_cmd_work() kfree(ndev)[3] | mod_timer(cmd_timer)[2] In short, the cleanup routine thought that the cmd_timer has already been detached by [1] but the mod_timer can re-attach the timer [2], even it is already released [3], resulting in UAF. This UAF is easy to trigger, crash trace by POC is like below [ 66.703713] ================================================================== [ 66.703974] BUG: KASAN: use-after-free in enqueue_timer+0x448/0x490 [ 66.703974] Write of size 8 at addr ffff888009fb7058 by task kworker/u4:1/33 [ 66.703974] [ 66.703974] CPU: 1 PID: 33 Comm: kworker/u4:1 Not tainted 5.18.0-rc2 #5 [ 66.703974] Workqueue: nfc2_nci_cmd_wq nci_cmd_work [ 66.703974] Call Trace: [ 66.703974] <TASK> [ 66.703974] dump_stack_lvl+0x57/0x7d [ 66.703974] print_report.cold+0x5e/0x5db [ 66.703974] ? enqueue_timer+0x448/0x490 [ 66.703974] kasan_report+0xbe/0x1c0 [ 66.703974] ? enqueue_timer+0x448/0x490 [ 66.703974] enqueue_timer+0x448/0x490 [ 66.703974] __mod_timer+0x5e6/0xb80 [ 66.703974] ? mark_held_locks+0x9e/0xe0 [ 66.703974] ? try_to_del_timer_sync+0xf0/0xf0 [ 66.703974] ? lockdep_hardirqs_on_prepare+0x17b/0x410 [ 66.703974] ? queue_work_on+0x61/0x80 [ 66.703974] ? lockdep_hardirqs_on+0xbf/0x130 [ 66.703974] process_one_work+0x8bb/0x1510 [ 66.703974] ? lockdep_hardirqs_on_prepare+0x410/0x410 [ 66.703974] ? pwq_dec_nr_in_flight+0x230/0x230 [ 66.703974] ? rwlock_bug.part.0+0x90/0x90 [ 66.703974] ? _raw_spin_lock_irq+0x41/0x50 [ 66.703974] worker_thread+0x575/0x1190 [ 66.703974] ? process_one_work+0x1510/0x1510 [ 66.703974] kthread+0x2a0/0x340 [ 66.703974] ? kthread_complete_and_exit+0x20/0x20 [ 66.703974] ret_from_fork+0x22/0x30 [ 66.703974] </TASK> [ 66.703974] [ 66.703974] Allocated by task 267: [ 66.703974] kasan_save_stack+0x1e/0x40 [ 66.703974] __kasan_kmalloc+0x81/0xa0 [ 66.703974] nci_allocate_device+0xd3/0x390 [ 66.703974] nfcmrvl_nci_register_dev+0x183/0x2c0 [ 66.703974] nfcmrvl_nci_uart_open+0xf2/0x1dd [ 66.703974] nci_uart_tty_ioctl+0x2c3/0x4a0 [ 66.703974] tty_ioctl+0x764/0x1310 [ 66.703974] __x64_sys_ioctl+0x122/0x190 [ 66.703974] do_syscall_64+0x3b/0x90 [ 66.703974] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 66.703974] [ 66.703974] Freed by task 406: [ 66.703974] kasan_save_stack+0x1e/0x40 [ 66.703974] kasan_set_track+0x21/0x30 [ 66.703974] kasan_set_free_info+0x20/0x30 [ 66.703974] __kasan_slab_free+0x108/0x170 [ 66.703974] kfree+0xb0/0x330 [ 66.703974] nfcmrvl_nci_unregister_dev+0x90/0xd0 [ 66.703974] nci_uart_tty_close+0xdf/0x180 [ 66.703974] tty_ldisc_kill+0x73/0x110 [ 66.703974] tty_ldisc_hangup+0x281/0x5b0 [ 66.703974] __tty_hangup.part.0+0x431/0x890 [ 66.703974] tty_release+0x3a8/0xc80 [ 66.703974] __fput+0x1f0/0x8c0 [ 66.703974] task_work_run+0xc9/0x170 [ 66.703974] exit_to_user_mode_prepare+0x194/0x1a0 [ 66.703974] syscall_exit_to_user_mode+0x19/0x50 [ 66.703974] do_syscall_64+0x48/0x90 [ 66.703974] entry_SYSCALL_64_after_hwframe+0x44/0xae To fix the UAF, this patch adds flush_workqueue() to ensure the nci_cmd_work is finished before the following del_timer_sync. This combination will promise the timer is actually detached. Fixes: 6a2968aaf50c ("NFC: basic NCI protocol implementation") Signed-off-by: Lin Ma <linma@zju.edu.cn> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2021-11-17NFC: add NCI_UNREG flag to eliminate the raceLin Ma1-2/+17
There are two sites that calls queue_work() after the destroy_workqueue() and lead to possible UAF. The first site is nci_send_cmd(), which can happen after the nci_close_device as below nfcmrvl_nci_unregister_dev | nfc_genl_dev_up nci_close_device | flush_workqueue | del_timer_sync | nci_unregister_device | nfc_get_device destroy_workqueue | nfc_dev_up nfc_unregister_device | nci_dev_up device_del | nci_open_device | __nci_request | nci_send_cmd | queue_work !!! Another site is nci_cmd_timer, awaked by the nci_cmd_work from the nci_send_cmd. ... | ... nci_unregister_device | queue_work destroy_workqueue | nfc_unregister_device | ... device_del | nci_cmd_work | mod_timer | ... | nci_cmd_timer | queue_work !!! For the above two UAF, the root cause is that the nfc_dev_up can race between the nci_unregister_device routine. Therefore, this patch introduce NCI_UNREG flag to easily eliminate the possible race. In addition, the mutex_lock in nci_close_device can act as a barrier. Signed-off-by: Lin Ma <linma@zju.edu.cn> Fixes: 6a2968aaf50c ("NFC: basic NCI protocol implementation") Reviewed-by: Jakub Kicinski <kuba@kernel.org> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Link: https://lore.kernel.org/r/20211116152732.19238-1-linma@zju.edu.cn Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2021-11-17NFC: reorganize the functions in nci_requestLin Ma1-4/+7
There is a possible data race as shown below: thread-A in nci_request() | thread-B in nci_close_device() | mutex_lock(&ndev->req_lock); test_bit(NCI_UP, &ndev->flags); | ... | test_and_clear_bit(NCI_UP, &ndev->flags) mutex_lock(&ndev->req_lock); | | This race will allow __nci_request() to be awaked while the device is getting removed. Similar to commit e2cb6b891ad2 ("bluetooth: eliminate the potential race condition when removing the HCI controller"). this patch alters the function sequence in nci_request() to prevent the data races between the nci_close_device(). Signed-off-by: Lin Ma <linma@zju.edu.cn> Fixes: 6a2968aaf50c ("NFC: basic NCI protocol implementation") Link: https://lore.kernel.org/r/20211115145600.8320-1-linma@zju.edu.cn Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2021-10-11nfc: drop unneeded debug printsKrzysztof Kozlowski1-4/+0
ftrace is a preferred and standard way to debug entering and exiting functions so drop useless debug prints. Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2021-08-02nfc: hci: pass callback data param as pointer in nci_request()Krzysztof Kozlowski1-61/+58
The nci_request() receives a callback function and unsigned long data argument "opt" which is passed to the callback. Almost all of the nci_request() callers pass pointer to a stack variable as data argument. Only few pass scalar value (e.g. u8). All such callbacks do not modify passed data argument and in previous commit they were made as const. However passing pointers via unsigned long removes the const annotation. The callback could simply cast unsigned long to a pointer to writeable memory. Use "const void *" as type of this "opt" argument to solve this and prevent modifying the pointed contents. This is also consistent with generic pattern of passing data arguments - via "void *". In few places which pass scalar values, use casts via "unsigned long" to suppress any warnings. Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2021-07-30nfc: hci: cleanup unneeded spacesKrzysztof Kozlowski1-4/+4
No need for multiple spaces in variable declaration (the code does not use them in other places). No functional change. Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2021-07-30nfc: nci: constify several pointers to u8, sk_buff and other structsKrzysztof Kozlowski1-19/+21
Several functions receive pointers to u8, sk_buff or other structs but do not modify the contents so make them const. This allows doing the same for local variables and in total makes the code a little bit safer. This makes const also data passed as "unsigned long opt" argument to nci_request() function. Usual flow for such functions is: 1. Receive "u8 *" and store it (the pointer) in a structure allocated on stack (e.g. struct nci_set_config_param), 2. Call nci_request() or __nci_request() passing a callback function an the pointer to the structure via an "unsigned long opt", 3. nci_request() calls the callback which dereferences "unsigned long opt" in a read-only way. This converts all above paths to use proper pointer to const data, so entire flow is safer. Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2021-07-25nfc: constify nfc_opsKrzysztof Kozlowski1-1/+1
Neither the core nor the drivers modify the passed pointer to struct nfc_ops, so make it a pointer to const for correctness and safety. Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2021-07-25nfc: constify nci_driver_ops (prop_ops and core_ops)Krzysztof Kozlowski1-8/+8
Neither the core nor the drivers modify the passed pointer to struct nci_driver_ops (consisting of function pointers), so make it a pointer to const for correctness and safety. Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2021-07-25nfc: constify nci_opsKrzysztof Kozlowski1-3/+2
The struct nci_ops is modified by NFC core in only one case: nci_allocate_device() receives too many proprietary commands (prop_ops) to configure. This is a build time known constrain, so a graceful handling of such case is not necessary. Instead, fail the nci_allocate_device() and add BUILD_BUG_ON() to places which set these. This allows to constify the struct nci_ops (consisting of function pointers) for correctness and safety. Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2021-07-25nfc: constify payload argument in nci_send_cmd()Krzysztof Kozlowski1-1/+1
The nci_send_cmd() payload argument is passed directly to skb_put_data() which already accepts a pointer to const, so make it const as well for correctness and safety. Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2021-05-17NFC: nci: fix memory leak in nci_allocate_deviceDongliang Mu1-0/+1
nfcmrvl_disconnect fails to free the hci_dev field in struct nci_dev. Fix this by freeing hci_dev in nci_free_device. BUG: memory leak unreferenced object 0xffff888111ea6800 (size 1024): comm "kworker/1:0", pid 19, jiffies 4294942308 (age 13.580s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 60 fd 0c 81 88 ff ff .........`...... 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<000000004bc25d43>] kmalloc include/linux/slab.h:552 [inline] [<000000004bc25d43>] kzalloc include/linux/slab.h:682 [inline] [<000000004bc25d43>] nci_hci_allocate+0x21/0xd0 net/nfc/nci/hci.c:784 [<00000000c59cff92>] nci_allocate_device net/nfc/nci/core.c:1170 [inline] [<00000000c59cff92>] nci_allocate_device+0x10b/0x160 net/nfc/nci/core.c:1132 [<00000000006e0a8e>] nfcmrvl_nci_register_dev+0x10a/0x1c0 drivers/nfc/nfcmrvl/main.c:153 [<000000004da1b57e>] nfcmrvl_probe+0x223/0x290 drivers/nfc/nfcmrvl/usb.c:345 [<00000000d506aed9>] usb_probe_interface+0x177/0x370 drivers/usb/core/driver.c:396 [<00000000bc632c92>] really_probe+0x159/0x4a0 drivers/base/dd.c:554 [<00000000f5009125>] driver_probe_device+0x84/0x100 drivers/base/dd.c:740 [<000000000ce658ca>] __device_attach_driver+0xee/0x110 drivers/base/dd.c:846 [<000000007067d05f>] bus_for_each_drv+0xb7/0x100 drivers/base/bus.c:431 [<00000000f8e13372>] __device_attach+0x122/0x250 drivers/base/dd.c:914 [<000000009cf68860>] bus_probe_device+0xc6/0xe0 drivers/base/bus.c:491 [<00000000359c965a>] device_add+0x5be/0xc30 drivers/base/core.c:3109 [<00000000086e4bd3>] usb_set_configuration+0x9d9/0xb90 drivers/usb/core/message.c:2164 [<00000000ca036872>] usb_generic_driver_probe+0x8c/0xc0 drivers/usb/core/generic.c:238 [<00000000d40d36f6>] usb_probe_device+0x5c/0x140 drivers/usb/core/driver.c:293 [<00000000bc632c92>] really_probe+0x159/0x4a0 drivers/base/dd.c:554 Reported-by: syzbot+19bcfc64a8df1318d1c3@syzkaller.appspotmail.com Fixes: 11f54f228643 ("NFC: nci: Add HCI over NCI protocol support") Signed-off-by: Dongliang Mu <mudongliangabcd@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2021-04-05net: nfc: Fix spelling errors in net/nfc moduleZheng Yongjun1-1/+1
These patches fix a series of spelling errors in net/nfc module. Reported-by: Hulk Robot <hulkci@huawei.com> Signed-off-by: Zheng Yongjun <zhengyongjun3@huawei.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2021-01-20Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/netJakub Kicinski1-1/+1
Conflicts: drivers/net/can/dev.c commit 03f16c5075b2 ("can: dev: can_restart: fix use after free bug") commit 3e77f70e7345 ("can: dev: move driver related infrastructure into separate subdir") Code move. drivers/net/dsa/b53/b53_common.c commit 8e4052c32d6b ("net: dsa: b53: fix an off by one in checking "vlan->vid"") commit b7a9e0da2d1c ("net: switchdev: remove vid_begin -> vid_end range from VLAN objects") Field rename. Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2021-01-19net: nfc: nci: fix the wrong NCI_CORE_INIT parametersBongsu Jeon1-1/+1
Fix the code because NCI_CORE_INIT_CMD includes two parameters in NCI2.0 but there is no parameters in NCI1.x. Fixes: bcd684aace34 ("net/nfc/nci: Support NCI 2.x initial sequence") Signed-off-by: Bongsu Jeon <bongsu.jeon@samsung.com> Link: https://lore.kernel.org/r/20210118205522.317087-1-bongsu.jeon@samsung.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2021-01-05net: nfc: nci: Change the NCI close sequenceBongsu Jeon1-2/+2
If there is a NCI command in work queue after closing the NCI device at nci_unregister_device, The NCI command timer starts at flush_workqueue function and then NCI command timeout handler would be called 5 second after flushing the NCI command work queue and destroying the queue. At that time, the timeout handler would try to use NCI command work queue that is destroyed already. it will causes the problem. To avoid this abnormal situation, change the sequence to prevent the NCI command timeout handler from being called after destroying the NCI command work queue. Signed-off-by: Bongsu Jeon <bongsu.jeon@samsung.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-12-04net/nfc/nci: Support NCI 2.x initial sequenceBongsu Jeon1-2/+16
implement the NCI 2.x initial sequence to support NCI 2.x NFCC. Since NCI 2.0, CORE_RESET and CORE_INIT sequence have been changed. If NFCEE supports NCI 2.x, then NCI 2.x initial sequence will work. In NCI 1.0, Initial sequence and payloads are as below: (DH) (NFCC) | -- CORE_RESET_CMD --> | | <-- CORE_RESET_RSP -- | | -- CORE_INIT_CMD --> | | <-- CORE_INIT_RSP -- | CORE_RESET_RSP payloads are Status, NCI version, Configuration Status. CORE_INIT_CMD payloads are empty. CORE_INIT_RSP payloads are Status, NFCC Features, Number of Supported RF Interfaces, Supported RF Interface, Max Logical Connections, Max Routing table Size, Max Control Packet Payload Size, Max Size for Large Parameters, Manufacturer ID, Manufacturer Specific Information. In NCI 2.0, Initial Sequence and Parameters are as below: (DH) (NFCC) | -- CORE_RESET_CMD --> | | <-- CORE_RESET_RSP -- | | <-- CORE_RESET_NTF -- | | -- CORE_INIT_CMD --> | | <-- CORE_INIT_RSP -- | CORE_RESET_RSP payloads are Status. CORE_RESET_NTF payloads are Reset Trigger, Configuration Status, NCI Version, Manufacturer ID, Manufacturer Specific Information Length, Manufacturer Specific Information. CORE_INIT_CMD payloads are Feature1, Feature2. CORE_INIT_RSP payloads are Status, NFCC Features, Max Logical Connections, Max Routing Table Size, Max Control Packet Payload Size, Max Data Packet Payload Size of the Static HCI Connection, Number of Credits of the Static HCI Connection, Max NFC-V RF Frame Size, Number of Supported RF Interfaces, Supported RF Interfaces. Signed-off-by: Bongsu Jeon <bongsu.jeon@samsung.com> Link: https://lore.kernel.org/r/20201202223147.3472-1-bongsu.jeon@samsung.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2020-10-30net: nfc: Fix kerneldoc warningsAndrew Lunn1-0/+2
net//nfc/core.c:1046: warning: Function parameter or member 'tx_headroom' not described in 'nfc_allocate_device' net//nfc/core.c:1046: warning: Function parameter or member 'tx_tailroom' not described in 'nfc_allocate_device' net//nfc/core.c:198: warning: Excess function parameter 'protocols' description in 'nfc_start_poll' net//nfc/core.c:198: warning: Function parameter or member 'im_protocols' not described in 'nfc_start_poll' net//nfc/core.c:198: warning: Function parameter or member 'tm_protocols' not described in 'nfc_start_poll' net//nfc/core.c:441: warning: Function parameter or member 'mode' not described in 'nfc_deactivate_target' net//nfc/core.c:711: warning: Function parameter or member 'dev' not described in 'nfc_alloc_send_skb' net//nfc/core.c:711: warning: Function parameter or member 'err' not described in 'nfc_alloc_send_skb' net//nfc/core.c:711: warning: Function parameter or member 'flags' not described in 'nfc_alloc_send_skb' net//nfc/core.c:711: warning: Function parameter or member 'sk' not described in 'nfc_alloc_send_skb' net//nfc/digital_core.c:470: warning: Function parameter or member 'im_protocols' not described in 'digital_start_poll' net//nfc/digital_core.c:470: warning: Function parameter or member 'nfc_dev' not described in 'digital_start_poll' net//nfc/digital_core.c:470: warning: Function parameter or member 'tm_protocols' not described in 'digital_start_poll' net//nfc/nci/core.c:1119: warning: Function parameter or member 'tx_headroom' not described in 'nci_allocate_device' net//nfc/nci/core.c:1119: warning: Function parameter or member 'tx_tailroom' not described in 'nci_allocate_device' Signed-off-by: Andrew Lunn <andrew@lunn.ch> Link: https://lore.kernel.org/r/20201028005653.930467-1-andrew@lunn.ch Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2020-07-25Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/netDavid S. Miller1-1/+4
The UDP reuseport conflict was a little bit tricky. The net-next code, via bpf-next, extracted the reuseport handling into a helper so that the BPF sk lookup code could invoke it. At the same time, the logic for reuseport handling of unconnected sockets changed via commit efc6b6f6c3113e8b203b9debfb72d81e0f3dcace which changed the logic to carry on the reuseport result into the rest of the lookup loop if we do not return immediately. This requires moving the reuseport_has_conns() logic into the callers. While we are here, get rid of inline directives as they do not belong in foo.c files. The other changes were cases of more straightforward overlapping modifications. Signed-off-by: David S. Miller <davem@davemloft.net>
2020-07-17nfc: nci: add missed destroy_workqueue in nci_register_deviceWang Hai1-1/+4
When nfc_register_device fails in nci_register_device, destroy_workqueue() shouled be called to destroy ndev->tx_wq. Fixes: 3c1c0f5dc80b ("NFC: NCI: Fix nci_register_device init sequence") Reported-by: Hulk Robot <hulkci@huawei.com> Signed-off-by: Wang Hai <wanghai38@huawei.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-07-13net: nfc: kerneldoc fixesAndrew Lunn1-2/+2
Simple fixes which require no deep knowledge of the code. Signed-off-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-06-19treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234Thomas Gleixner1-13/+1
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not see http www gnu org licenses extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 503 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Enrico Weigelt <info@metux.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190602204653.811534538@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-11-21treewide: setup_timer() -> timer_setup()Kees Cook1-8/+6
This converts all remaining cases of the old setup_timer() API into using timer_setup(), where the callback argument is the structure already holding the struct timer_list. These should have no behavioral changes, since they just change which pointer is passed into the callback with the same available pointers after conversion. It handles the following examples, in addition to some other variations. Casting from unsigned long: void my_callback(unsigned long data) { struct something *ptr = (struct something *)data; ... } ... setup_timer(&ptr->my_timer, my_callback, ptr); and forced object casts: void my_callback(struct something *ptr) { ... } ... setup_timer(&ptr->my_timer, my_callback, (unsigned long)ptr); become: void my_callback(struct timer_list *t) { struct something *ptr = from_timer(ptr, t, my_timer); ... } ... timer_setup(&ptr->my_timer, my_callback, 0); Direct function assignments: void my_callback(unsigned long data) { struct something *ptr = (struct something *)data; ... } ... ptr->my_timer.function = my_callback; have a temporary cast added, along with converting the args: void my_callback(struct timer_list *t) { struct something *ptr = from_timer(ptr, t, my_timer); ... } ... ptr->my_timer.function = (TIMER_FUNC_TYPE)my_callback; And finally, callbacks without a data assignment: void my_callback(unsigned long data) { ... } ... setup_timer(&ptr->my_timer, my_callback, 0); have their argument renamed to verify they're unused during conversion: void my_callback(struct timer_list *unused) { ... } ... timer_setup(&ptr->my_timer, my_callback, 0); The conversion is done with the following Coccinelle script: spatch --very-quiet --all-includes --include-headers \ -I ./arch/x86/include -I ./arch/x86/include/generated \ -I ./include -I ./arch/x86/include/uapi \ -I ./arch/x86/include/generated/uapi -I ./include/uapi \ -I ./include/generated/uapi --include ./include/linux/kconfig.h \ --dir . \ --cocci-file ~/src/data/timer_setup.cocci @fix_address_of@ expression e; @@ setup_timer( -&(e) +&e , ...) // Update any raw setup_timer() usages that have a NULL callback, but // would otherwise match change_timer_function_usage, since the latter // will update all function assignments done in the face of a NULL // function initialization in setup_timer(). @change_timer_function_usage_NULL@ expression _E; identifier _timer; type _cast_data; @@ ( -setup_timer(&_E->_timer, NULL, _E); +timer_setup(&_E->_timer, NULL, 0); | -setup_timer(&_E->_timer, NULL, (_cast_data)_E); +timer_setup(&_E->_timer, NULL, 0); | -setup_timer(&_E._timer, NULL, &_E); +timer_setup(&_E._timer, NULL, 0); | -setup_timer(&_E._timer, NULL, (_cast_data)&_E); +timer_setup(&_E._timer, NULL, 0); ) @change_timer_function_usage@ expression _E; identifier _timer; struct timer_list _stl; identifier _callback; type _cast_func, _cast_data; @@ ( -setup_timer(&_E->_timer, _callback, _E); +timer_setup(&_E->_timer, _callback, 0); | -setup_timer(&_E->_timer, &_callback, _E); +timer_setup(&_E->_timer, _callback, 0); | -setup_timer(&_E->_timer, _callback, (_cast_data)_E); +timer_setup(&_E->_timer, _callback, 0); | -setup_timer(&_E->_timer, &_callback, (_cast_data)_E); +timer_setup(&_E->_timer, _callback, 0); | -setup_timer(&_E->_timer, (_cast_func)_callback, _E); +timer_setup(&_E->_timer, _callback, 0); | -setup_timer(&_E->_timer, (_cast_func)&_callback, _E); +timer_setup(&_E->_timer, _callback, 0); | -setup_timer(&_E->_timer, (_cast_func)_callback, (_cast_data)_E); +timer_setup(&_E->_timer, _callback, 0); | -setup_timer(&_E->_timer, (_cast_func)&_callback, (_cast_data)_E); +timer_setup(&_E->_timer, _callback, 0); | -setup_timer(&_E._timer, _callback, (_cast_data)_E); +timer_setup(&_E._timer, _callback, 0); | -setup_timer(&_E._timer, _callback, (_cast_data)&_E); +timer_setup(&_E._timer, _callback, 0); | -setup_timer(&_E._timer, &_callback, (_cast_data)_E); +timer_setup(&_E._timer, _callback, 0); | -setup_timer(&_E._timer, &_callback, (_cast_data)&_E); +timer_setup(&_E._timer, _callback, 0); | -setup_timer(&_E._timer, (_cast_func)_callback, (_cast_data)_E); +timer_setup(&_E._timer, _callback, 0); | -setup_timer(&_E._timer, (_cast_func)_callback, (_cast_data)&_E); +timer_setup(&_E._timer, _callback, 0); | -setup_timer(&_E._timer, (_cast_func)&_callback, (_cast_data)_E); +timer_setup(&_E._timer, _callback, 0); | -setup_timer(&_E._timer, (_cast_func)&_callback, (_cast_data)&_E); +timer_setup(&_E._timer, _callback, 0); | _E->_timer@_stl.function = _callback; | _E->_timer@_stl.function = &_callback; | _E->_timer@_stl.function = (_cast_func)_callback; | _E->_timer@_stl.function = (_cast_func)&_callback; | _E._timer@_stl.function = _callback; | _E._timer@_stl.function = &_callback; | _E._timer@_stl.function = (_cast_func)_callback; | _E._timer@_stl.function = (_cast_func)&_callback; ) // callback(unsigned long arg) @change_callback_handle_cast depends on change_timer_function_usage@ identifier change_timer_function_usage._callback; identifier change_timer_function_usage._timer; type _origtype; identifier _origarg; type _handletype; identifier _handle; @@ void _callback( -_origtype _origarg +struct timer_list *t ) { ( ... when != _origarg _handletype *_handle = -(_handletype *)_origarg; +from_timer(_handle, t, _timer); ... when != _origarg | ... when != _origarg _handletype *_handle = -(void *)_origarg; +from_timer(_handle, t, _timer); ... when != _origarg | ... when != _origarg _handletype *_handle; ... when != _handle _handle = -(_handletype *)_origarg; +from_timer(_handle, t, _timer); ... when != _origarg | ... when != _origarg _handletype *_handle; ... when != _handle _handle = -(void *)_origarg; +from_timer(_handle, t, _timer); ... when != _origarg ) } // callback(unsigned long arg) without existing variable @change_callback_handle_cast_no_arg depends on change_timer_function_usage && !change_callback_handle_cast@ identifier change_timer_function_usage._callback; identifier change_timer_function_usage._timer; type _origtype; identifier _origarg; type _handletype; @@ void _callback( -_origtype _origarg +struct timer_list *t ) { + _handletype *_origarg = from_timer(_origarg, t, _timer); + ... when != _origarg - (_handletype *)_origarg + _origarg ... when != _origarg } // Avoid already converted callbacks. @match_callback_converted depends on change_timer_function_usage && !change_callback_handle_cast && !change_callback_handle_cast_no_arg@ identifier change_timer_function_usage._callback; identifier t; @@ void _callback(struct timer_list *t) { ... } // callback(struct something *handle) @change_callback_handle_arg depends on change_timer_function_usage && !match_callback_converted && !change_callback_handle_cast && !change_callback_handle_cast_no_arg@ identifier change_timer_function_usage._callback; identifier change_timer_function_usage._timer; type _handletype; identifier _handle; @@ void _callback( -_handletype *_handle +struct timer_list *t ) { + _handletype *_handle = from_timer(_handle, t, _timer); ... } // If change_callback_handle_arg ran on an empty function, remove // the added handler. @unchange_callback_handle_arg depends on change_timer_function_usage && change_callback_handle_arg@ identifier change_timer_function_usage._callback; identifier change_timer_function_usage._timer; type _handletype; identifier _handle; identifier t; @@ void _callback(struct timer_list *t) { - _handletype *_handle = from_timer(_handle, t, _timer); } // We only want to refactor the setup_timer() data argument if we've found // the matching callback. This undoes changes in change_timer_function_usage. @unchange_timer_function_usage depends on change_timer_function_usage && !change_callback_handle_cast && !change_callback_handle_cast_no_arg && !change_callback_handle_arg@ expression change_timer_function_usage._E; identifier change_timer_function_usage._timer; identifier change_timer_function_usage._callback; type change_timer_function_usage._cast_data; @@ ( -timer_setup(&_E->_timer, _callback, 0); +setup_timer(&_E->_timer, _callback, (_cast_data)_E); | -timer_setup(&_E._timer, _callback, 0); +setup_timer(&_E._timer, _callback, (_cast_data)&_E); ) // If we fixed a callback from a .function assignment, fix the // assignment cast now. @change_timer_function_assignment depends on change_timer_function_usage && (change_callback_handle_cast || change_callback_handle_cast_no_arg || change_callback_handle_arg)@ expression change_timer_function_usage._E; identifier change_timer_function_usage._timer; identifier change_timer_function_usage._callback; type _cast_func; typedef TIMER_FUNC_TYPE; @@ ( _E->_timer.function = -_callback +(TIMER_FUNC_TYPE)_callback ; | _E->_timer.function = -&_callback +(TIMER_FUNC_TYPE)_callback ; | _E->_timer.function = -(_cast_func)_callback; +(TIMER_FUNC_TYPE)_callback ; | _E->_timer.function = -(_cast_func)&_callback +(TIMER_FUNC_TYPE)_callback ; | _E._timer.function = -_callback +(TIMER_FUNC_TYPE)_callback ; | _E._timer.function = -&_callback; +(TIMER_FUNC_TYPE)_callback ; | _E._timer.function = -(_cast_func)_callback +(TIMER_FUNC_TYPE)_callback ; | _E._timer.function = -(_cast_func)&_callback +(TIMER_FUNC_TYPE)_callback ; ) // Sometimes timer functions are called directly. Replace matched args. @change_timer_function_calls depends on change_timer_function_usage && (change_callback_handle_cast || change_callback_handle_cast_no_arg || change_callback_handle_arg)@ expression _E; identifier change_timer_function_usage._timer; identifier change_timer_function_usage._callback; type _cast_data; @@ _callback( ( -(_cast_data)_E +&_E->_timer | -(_cast_data)&_E +&_E._timer | -_E +&_E->_timer ) ) // If a timer has been configured without a data argument, it can be // converted without regard to the callback argument, since it is unused. @match_timer_function_unused_data@ expression _E; identifier _timer; identifier _callback; @@ ( -setup_timer(&_E->_timer, _callback, 0); +timer_setup(&_E->_timer, _callback, 0); | -setup_timer(&_E->_timer, _callback, 0L); +timer_setup(&_E->_timer, _callback, 0); | -setup_timer(&_E->_timer, _callback, 0UL); +timer_setup(&_E->_timer, _callback, 0); | -setup_timer(&_E._timer, _callback, 0); +timer_setup(&_E._timer, _callback, 0); | -setup_timer(&_E._timer, _callback, 0L); +timer_setup(&_E._timer, _callback, 0); | -setup_timer(&_E._timer, _callback, 0UL); +timer_setup(&_E._timer, _callback, 0); | -setup_timer(&_timer, _callback, 0); +timer_setup(&_timer, _callback, 0); | -setup_timer(&_timer, _callback, 0L); +timer_setup(&_timer, _callback, 0); | -setup_timer(&_timer, _callback, 0UL); +timer_setup(&_timer, _callback, 0); | -setup_timer(_timer, _callback, 0); +timer_setup(_timer, _callback, 0); | -setup_timer(_timer, _callback, 0L); +timer_setup(_timer, _callback, 0); | -setup_timer(_timer, _callback, 0UL); +timer_setup(_timer, _callback, 0); ) @change_callback_unused_data depends on match_timer_function_unused_data@ identifier match_timer_function_unused_data._callback; type _origtype; identifier _origarg; @@ void _callback( -_origtype _origarg +struct timer_list *unused ) { ... when != _origarg } Signed-off-by: Kees Cook <keescook@chromium.org>
2017-06-23nfc: nci: remove unnecessary null checkGustavo A. R. Silva1-5/+4
Remove unnecessary NULL check for pointer conn_info. conn_info is set in list_for_each_entry() using container_of(), which is never NULL. Addresses-Coverity-ID: 1362349 Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2017-06-18NFC: fix broken device allocationJohan Hovold1-2/+1
Commit 7eda8b8e9677 ("NFC: Use IDR library to assing NFC devices IDs") moved device-id allocation and struct-device initialisation from nfc_allocate_device() to nfc_register_device(). This broke just about every nfc-device-registration error path, which continue to call nfc_free_device() that tries to put the device reference of the now uninitialised (but zeroed) struct device: kobject: '(null)' (ce316420): is not initialized, yet kobject_put() is being called. The late struct-device initialisation also meant that various work queues whose names are derived from the nfc device name were also misnamed: 421 root 0 SW< [(null)_nci_cmd_] 422 root 0 SW< [(null)_nci_rx_w] 423 root 0 SW< [(null)_nci_tx_w] Move the id-allocation and struct-device initialisation back to nfc_allocate_device() and fix up the single call site which did not use nfc_free_device() in its error path. Fixes: 7eda8b8e9677 ("NFC: Use IDR library to assing NFC devices IDs") Cc: stable <stable@vger.kernel.org> # 3.8 Cc: Samuel Ortiz <sameo@linux.intel.com> Signed-off-by: Johan Hovold <johan@kernel.org> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2017-06-16networking: make skb_put & friends return void pointersJohannes Berg1-1/+1
It seems like a historic accident that these return unsigned char *, and in many places that means casts are required, more often than not. Make these functions (skb_put, __skb_put and pskb_put) return void * and remove all the casts across the tree, adding a (u8 *) cast only where the unsigned char pointer was used directly, all done with the following spatch: @@ expression SKB, LEN; typedef u8; identifier fn = { skb_put, __skb_put }; @@ - *(fn(SKB, LEN)) + *(u8 *)fn(SKB, LEN) @@ expression E, SKB, LEN; identifier fn = { skb_put, __skb_put }; type T; @@ - E = ((T *)(fn(SKB, LEN))) + E = fn(SKB, LEN) which actually doesn't cover pskb_put since there are only three users overall. A handful of stragglers were converted manually, notably a macro in drivers/isdn/i4l/isdn_bsdcomp.c and, oddly enough, one of the many instances in net/bluetooth/hci_sock.c. In the former file, I also had to fix one whitespace problem spatch introduced. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-06-16networking: introduce and use skb_put_data()Johannes Berg1-2/+2
A common pattern with skb_put() is to just want to memcpy() some data into the new space, introduce skb_put_data() for this. An spatch similar to the one for skb_put_zero() converts many of the places using it: @@ identifier p, p2; expression len, skb, data; type t, t2; @@ ( -p = skb_put(skb, len); +p = skb_put_data(skb, data, len); | -p = (t)skb_put(skb, len); +p = skb_put_data(skb, data, len); ) ( p2 = (t2)p; -memcpy(p2, data, len); | -memcpy(p, data, len); ) @@ type t, t2; identifier p, p2; expression skb, data; @@ t *p; ... ( -p = skb_put(skb, sizeof(t)); +p = skb_put_data(skb, data, sizeof(t)); | -p = (t *)skb_put(skb, sizeof(t)); +p = skb_put_data(skb, data, sizeof(t)); ) ( p2 = (t2)p; -memcpy(p2, data, sizeof(*p)); | -memcpy(p, data, sizeof(*p)); ) @@ expression skb, len, data; @@ -memcpy(skb_put(skb, len), data, len); +skb_put_data(skb, data, len); (again, manually post-processed to retain some comments) Reviewed-by: Stephen Hemminger <stephen@networkplumber.org> Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-05-04nfc: nci: Add nci_nfcc_loopback to the nci coreChristophe Ricard1-0/+77
For test purpose, provide the generic nci loopback function. Signed-off-by: Christophe Ricard <christophe-h.ricard@st.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2016-05-04nfc: nci: Add an additional parameter to identify a connection idChristophe Ricard1-7/+18
According to NCI specification, destination type and destination specific parameters shall uniquely identify a single destination for the Logical Connection. Signed-off-by: Christophe Ricard <christophe-h.ricard@st.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2016-05-04nfc: nci: Fix nci_core_conn_closeChristophe Ricard1-0/+1
nci_core_conn_close was not retrieving a conn_info using the correct connection id. Signed-off-by: Christophe Ricard <christophe-h.ricard@st.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2016-05-04nfc: nci: Fix nci_core_conn_create to allowing empty destinationChristophe Ricard1-9/+9
NCI_CORE_CONN_CREATE may not have any destination type parameter. Signed-off-by: Christophe Ricard <christophe-h.ricard@st.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2015-12-29NFC: nci: memory leak in nci_core_conn_create()Dan Carpenter1-3/+3
I've moved the check for "number_destination_params" forward a few lines to avoid leaking "cmd". Fixes: caa575a86ec1 ('NFC: nci: fix possible crash in nci_core_conn_create') Acked-by: Christophe Ricard <christophe-h.ricard@st.com> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2015-10-28NFC: nci: non-static functions can not be inlineRobert Dolca1-8/+8
This fixes a build error that seems to be toochain dependent (Not seen with gcc v5.1): In file included from net/nfc/nci/rsp.c:36:0: net/nfc/nci/rsp.c: In function ‘nci_rsp_packet’: include/net/nfc/nci_core.h:355:12: error: inlining failed in call to always_inline ‘nci_prop_rsp_packet’: function body not available inline int nci_prop_rsp_packet(struct nci_dev *ndev, __u16 opcode, Signed-off-by: Robert Dolca <robert.dolca@intel.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2015-10-27NFC: NCI: export nci_send_frame and nci_send_cmd functionVincent Cuissard1-1/+3
Export nci_send_frame and nci_send_cmd symbols to allow drivers to use it. This is needed for example if NCI is used during firmware download phase. Signed-off-by: Vincent Cuissard <cuissard@marvell.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2015-10-27NFC: netlink: Add mode parameter to deactivate_target functionsChristophe Ricard1-4/+11
In order to manage in a better way the nci poll mode state machine, add mode parameter to deactivate_target functions. This way we can manage different target state. mode parameter make sense only in nci core. Signed-off-by: Christophe Ricard <christophe-h.ricard@st.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2015-10-25NFC: nci: add nci_get_conn_info_by_id functionRobert Dolca1-0/+13
This functin takes as a parameter a pointer to the nci_dev struct and the first byte from the values of the first domain specific parameter that was used for the connection creation. Signed-off-by: Robert Dolca <robert.dolca@intel.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2015-10-25NFC: nci: fix possible crash in nci_core_conn_createRobert Dolca1-1/+8
If the number of destination speific parameters supplied is 0 the call will fail. If the first destination specific parameter does not have a value, curr_id will be set to 0. Signed-off-by: Robert Dolca <robert.dolca@intel.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2015-10-25NFC: nci: rename nci_prop_ops to nci_driver_opsRobert Dolca1-8/+8
Initially it was used to create hooks in the driver for proprietary operations. Currently it is being used for hooks for both proprietary and generic operations. Signed-off-by: Robert Dolca <robert.dolca@intel.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2015-10-25NFC: nci: Allow the driver to set handler for core nci opsRobert Dolca1-20/+51
The driver may be required to act when some responses or notifications arrive. For example the NCI core does not have a handler for NCI_OP_CORE_GET_CONFIG_RSP. The NFCC can send a config response that has to be read by the driver and the packet may contain vendor specific data. The Fields Peak driver needs to take certain actions when a reset notification arrives (packet also not handled by the nfc core). The driver handlers do not interfere with the core and they are called after the core processes the packet. Signed-off-by: Robert Dolca <robert.dolca@intel.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2015-10-25NFC: nci: Introduce nci_core_cmdRobert Dolca1-5/+19
This allows sending core commands from the driver. The driver should be able to send NCI core commands like CORE_GET_CONFIG_CMD. Signed-off-by: Robert Dolca <robert.dolca@intel.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2015-10-25NFC: nci: Do not call post_setup when setup failsRobert Dolca1-2/+1
The driver should know that it can continue with post setup where setup left off. Being able to execute post_setup when setup fails may force the developer to keep this state in the driver. Signed-off-by: Robert Dolca <robert.dolca@intel.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2015-10-03NFC: nci: Use __nci_request for exported routinesSamuel Ortiz1-5/+6
Since we do not know in which context drivers will call these routines, they should use the unlocked version of nci_request, i.e. __nci_request. It is up to drivers to know/decide if they need to take the req_lock mutex before calling those routines. When being called from the NCI setup routine there is no need to do so as ops->setup is called under req_lock. Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2015-08-20NFC: nci: export nci_core_reset and nci_core_initRobert Baldyga1-0/+14
Some drivers needs to have ability to reinit NCI core, for example after updating firmware in setup() of post_setup() callback. This patch makes nci_core_reset() and nci_core_init() functions public, to make it possible. Signed-off-by: Robert Baldyga <r.baldyga@samsung.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2015-08-20NFC: nci: Add post_setup handlerRobert Baldyga1-0/+4
Some drivers require non-standard configuration after NCI_CORE_INIT request, because they need to know ndev->manufact_specific_info or ndev->manufact_id. This patch adds post_setup handler allowing to do such custom configuration. Signed-off-by: Robert Baldyga <r.baldyga@samsung.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2015-06-13NFC: nci: remove current SLEEP mode managementVincent Cuissard1-1/+1
NCI deactivate management was modified to support all NCI deactivation type. Problem is that all the API are not ready yet for it. Problem is that with current code, when neard asks to deactivate the tag it sends a deactivate SLEEP but nobody will then send a IDLE deactivate. This IDLE deactivate is mandatory since NFC controller can only be unlocked by DH. Signed-off-by: Vincent Cuissard <cuissard@marvell.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2015-06-10NFC: nci: Export nci_req_completeSamuel Ortiz1-0/+1
Drivers implementing proprietary ops may need it now. Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2015-06-09NFC: nci: Move close ops call in nci_close_deviceChristophe Ricard1-4/+6
When closing the device some data (proprietary commands) might be sent. The core state machine needs to be set for correct command execution. Signed-off-by: Christophe Ricard <christophe-h.ricard@st.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2015-06-09NFC: nci: Add nci_prop_cmd allowing to send proprietary nci cmdChristophe Ricard1-0/+26
Handle allowing to send proprietary nci commands anywhere in the nci state machine. Signed-off-by: Christophe Ricard <christophe-h.ricard@st.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2015-06-09NFC: nci: Add nci init ops for early device initializationChristophe Ricard1-2/+7
Some device may need to execute some proprietary commands in order to "wake-up"; Before the nci state initialization. Signed-off-by: Christophe Ricard <christophe-h.ricard@st.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2015-06-09NFC: nci: Add NCI_RESET return code check before setupChristophe Ricard1-2/+3
setup was executed in any case, even if NCI_RESET failed. Signed-off-by: Christophe Ricard <christophe-h.ricard@st.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
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