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

drm/amd/display: Avoid a NULL pointer dereference

[WHY]
Although unlikely drm_atomic_get_new_connector_state() or
drm_atomic_get_old_connector_state() can return NULL.

[HOW]
Check returns before dereference.

(cherry picked from commit 1e5e8d672fec9f2ab352be121be971877bff2af9)