CVE-2024-49905

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

drm/amd/display: Add null check for afb in amdgpu_dm_plane_handle_cursor_update (v2)

This commit adds a null check for the afb variable in the amdgpu_dm_plane_handle_cursor_update function. Previously, afb was assumed to be null, but was used later in the code without a null check. This could potentially lead to a null pointer dereference.

Changes since v1:

• Moved the null check for afb to the line where afb is used. (Alex)

Fixes the below: drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm_plane.c:1298 amdgpu_dm_plane_handle_cursor_update() error: we previously assumed afb could be null (see line 1252)

Weakness

A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit.

Affected Software

Potential Mitigations

References

• https://git.kernel.org/stable/c/75839e2365b666ff4e1b9047e442cab138eac4f6
• https://git.kernel.org/stable/c/9132882eaae4d21d2fc5843b3308379a481ebdf0
• https://git.kernel.org/stable/c/bd0e24e5e608ccb9fdda300bb974496d6d8cf57d
• https://git.kernel.org/stable/c/cd9e9e0852d501f169aa3bb34e4b413d2eb48c37
• https://git.kernel.org/stable/c/e4e26cbe34d7c1c1db5fb7b3101573c29866439f