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

drm/amd/display: Don't refer to dc_sink in is_dsc_need_re_compute

[Why]
When unplug one of monitors connected after mst hub, encounter null pointer dereference.

It's due to dc_sink get released immediately in early_unregister() or detect_ctx(). When
commit new state which directly referring to info stored in dc_sink will cause null pointer
dereference.

[how]
Remove redundant checking condition. Relevant condition should already be covered by checking
if dsc_aux is null or not. Also reset dsc_aux to NULL when the connector is disconnected.

References

• https://nvd.nist.gov/vuln/detail/CVE-2024-44955
• https://git.kernel.org/stable/c/39b217193729aa45eded8de24d9245468a0c0263
• https://git.kernel.org/stable/c/fcf6a49d79923a234844b8efe830a61f3f0584e4
• https://git.kernel.org/stable/c/c7e65cab54a89f4df54110f0b44c4ade93d1a911