In the Linux kernel, the following vulnerability has been resolved:
drm/amd/display: Don't refer to dcsink in isdscneedre_compute
[Why] When unplug one of monitors connected after mst hub, encounter null pointer dereference.
It's due to dcsink get released immediately in earlyunregister() or detectctx(). When commit new state which directly referring to info stored in dcsink will cause null pointer dereference.
[how] Remove redundant checking condition. Relevant condition should already be covered by checking if dscaux is null or not. Also reset dscaux to NULL when the connector is disconnected.