CVE-2024-26729

/// Technical description

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

drm/amd/display: Fix potential null pointer dereference in dc_dmub_srv

Fixes potential null pointer dereference warnings in the

dc_dmub_srv_cmd_list_queue_execute() and dc_dmub_srv_is_hw_pwr_up()

functions.

In both functions, the 'dc_dmub_srv' variable was being dereferenced

before it was checked for null. This could lead to a null pointer

dereference if 'dc_dmub_srv' is null. The fix is to check if

'dc_dmub_srv' is null before dereferencing it.

Thus moving the null checks for 'dc_dmub_srv' to the beginning of the

functions to ensure that 'dc_dmub_srv' is not null when it is

dereferenced.

Found by smatch & thus fixing the below:

drivers/gpu/drm/amd/amdgpu/../display/dc/dc_dmub_srv.c:133 dc_dmub_srv_cmd_list_queue_execute() warn: variable dereferenced before check 'dc_dmub_srv' (see line 128)

drivers/gpu/drm/amd/amdgpu/../display/dc/dc_dmub_srv.c:1167 dc_dmub_srv_is_hw_pwr_up() warn: variable dereferenced before ch

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References