Re: [PATCH] drm/vc4: Use managed KMS polling to fix UAF on unbind

[Maíra Canal]

On Sat, 22 Aug 2026 16:31:10 +0200, Karl Mehltretter wrote:
> vc4_kms_load() calls drm_kms_helper_poll_init() but the driver provides
> no matching drm_kms_helper_poll_fini(). The output poll work stays
> scheduled after unbind and runs on the freed drm_device:
> 
>   # modprobe vc4; rmmod vc4; sleep 10
>   BUG: KASAN: slab-use-after-free in delayed_work_timer_fn
>   BUG: KASAN: slab-use-after-free in drm_client_dev_hotplug [drm]
>   Workqueue: events output_poll_execute [drm_kms_helper]
>   Allocated by task 171: __devm_drm_dev_alloc
>   Freed by task 262 (rmmod): drm_dev_put / component_del
> 
> [...]

Applied, thanks!

[1/1] drm/vc4: Use managed KMS polling to fix UAF on unbind
      commit: 073a30d75f309812ed61af134f24ffef4107b13a

Best regards,
- Maíra