CVE-2024-39509

In the Linux kernel, the following vulnerability has been resolved:

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

...