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| author | Nikita Zhandarovich <n.zhandarovich@fintech.ru> | 2024-05-17 17:19:14 +0300 |
|---|---|---|
| committer | Jiri Kosina <jkosina@suse.com> | 2024-06-04 10:49:35 +0300 |
| commit | 4aa2dcfbad538adf7becd0034a3754e1bd01b2b5 (patch) | |
| tree | acdcc3c5d40ef6b3c6a10911fb5c4af6b9bf9fbc /drivers | |
| parent | 0a3f9f7fc59feb8a91a2793b8b60977895c72365 (diff) | |
| download | linux-4aa2dcfbad538adf7becd0034a3754e1bd01b2b5.tar.xz | |
HID: core: remove unnecessary WARN_ON() in implement()
Syzkaller hit a warning [1] in a call to implement() when trying
to write a value into a field of smaller size in an output report.
Since implement() already has a warn message printed out with the
help of hid_warn() and value in question gets trimmed with:
...
value &= m;
...
WARN_ON may be considered superfluous. Remove it to suppress future
syzkaller triggers.
[1]
WARNING: CPU: 0 PID: 5084 at drivers/hid/hid-core.c:1451 implement drivers/hid/hid-core.c:1451 [inline]
WARNING: CPU: 0 PID: 5084 at drivers/hid/hid-core.c:1451 hid_output_report+0x548/0x760 drivers/hid/hid-core.c:1863
Modules linked in:
CPU: 0 PID: 5084 Comm: syz-executor424 Not tainted 6.9.0-rc7-syzkaller-00183-gcf87f46fd34d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
RIP: 0010:implement drivers/hid/hid-core.c:1451 [inline]
RIP: 0010:hid_output_report+0x548/0x760 drivers/hid/hid-core.c:1863
...
Call Trace:
<TASK>
__usbhid_submit_report drivers/hid/usbhid/hid-core.c:591 [inline]
usbhid_submit_report+0x43d/0x9e0 drivers/hid/usbhid/hid-core.c:636
hiddev_ioctl+0x138b/0x1f00 drivers/hid/usbhid/hiddev.c:726
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:904 [inline]
__se_sys_ioctl+0xfc/0x170 fs/ioctl.c:890
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
...
Fixes: 95d1c8951e5b ("HID: simplify implement() a bit")
Reported-by: <syzbot+5186630949e3c55f0799@syzkaller.appspotmail.com>
Suggested-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Nikita Zhandarovich <n.zhandarovich@fintech.ru>
Signed-off-by: Jiri Kosina <jkosina@suse.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/hid/hid-core.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c index b1fa0378e8f4..74efda212c55 100644 --- a/drivers/hid/hid-core.c +++ b/drivers/hid/hid-core.c @@ -1448,7 +1448,6 @@ static void implement(const struct hid_device *hid, u8 *report, hid_warn(hid, "%s() called with too large value %d (n: %d)! (%s)\n", __func__, value, n, current->comm); - WARN_ON(1); value &= m; } } |