drm/amd/display: Handle dml allocation failure to avoid crash

CVE-2024-53133

What is CVE-2024-53133?

In the Linux kernel, a vulnerability is present within the AMD display driver relating to the handling of DML (Display Management Layer) allocation failures. When a DML allocation does not succeed, the existing DML contexts become invalid. Subsequent operations attempt to copy these invalid states, potentially leading to a shallow copy of corrupted memory. If the invalid state is released afterward, this can result in a double free scenario, causing system instability or crashes. A resolution has been implemented to reset the DML pointers in the new state to NULL, ensuring that invalid pointers are avoided and stability is maintained.

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References