Re: [PATCH v3] HID: rate-limit hid_warn to prevent log flooding

[Jiri Kosina]

On Fri, 20 Jun 2025, Li Chen wrote:

> From: Li Chen <chenl311@xxxxxxxxxxxxxxx>
> 
> Syzkaller can create many uhid devices that trigger
> repeated warnings like:
> 
>   "hid-generic xxxx: unknown main item tag 0x0"
> 
> These messages can flood the system log, especially if a crash occurs
> (e.g., with a slow UART console, leading to soft lockups). To mitigate
> this, convert `hid_warn()` to use `dev_warn_ratelimited()`.
> 
> This helps reduce log noise and improves system stability under fuzzing
> or faulty device scenarios.
> 
> Signed-off-by: Li Chen <chenl311@xxxxxxxxxxxxxxx>
> ---
> Changelog:
> 
> v2: Introduce hid_warn_ratelimited to rate-limit the specified log.
> v3: also ratelimit "reserved main item tag ..."

Applied, thanks.

-- 
Jiri Kosina
SUSE Labs