CVE-2025-39705

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

drm/amd/display: fix a Null pointer dereference vulnerability

[Why]

A null pointer dereference vulnerability exists in the AMD display driver's

(DC module) cleanup function dc_destruct().

When display control context (dc->ctx) construction fails

(due to memory allocation failure), this pointer remains NULL.

During subsequent error handling when dc_destruct() is called,

there's no NULL check before dereferencing the perf_trace member

(dc->ctx->perf_trace), causing a kernel null pointer dereference crash.

[How]

Check if dc->ctx is non-NULL before dereferencing.

(Updated commit text and removed unnecessary error message)

(cherry picked from commit 9dd8e2ba268c636c240a918e0a31e6feaee19404)