Re: [PATCH v3] staging: media: atomisp: add missing mutex lock in atomisp_s_fmt_cap

[Dan Carpenter]

On Thu, Jul 17, 2025 at 03:42:34PM +0300, Abdelrahman Fekry wrote:
> The function atomisp_set_fmt() modifies shared device state and expects
> callers to hold the isp->mutex for synchronization. While most internal
> callers correctly lock the mutex before invoking atomisp_set_fmt(), the
> V4L2 ioctl handler atomisp_s_fmt_cap() does not.
> 
> This results in an unsafe execution path for VIDIOC_S_FMT ioctls
> (e.g. via v4l2-ctl), where shared structures such as pipe->pix and
> pipe->frame_info may be modified concurrently without proper protection.
> 
> - Fix this by explicitly locking isp->mutex in atomisp_s_fmt_cap().
> 
> Fixes: 4bdab80981ca ("media: atomisp: Make it possible to call atomisp_set_fmt() without a file handle")
> Signed-off-by: Abdelrahman Fekry <abdelrahmanfekry375@xxxxxxxxx>
> ---

Thanks!

Reviewed-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>

regards,
dan carpenter