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
