Bug 2320428 (CVE-2024-49908)

Summary: CVE-2024-49908 kernel: drm/amd/display: Add null check for 'afb' in amdgpu_dm_update_cursor (v2)
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
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Hardware: All   
OS: Linux   
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Bug Depends On: 2320761    
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Description OSIDB Bzimport 2024-10-21 19:01:20 UTC 
In the Linux kernel, the following vulnerability has been resolved:

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

This commit adds a null check for the 'afb' variable in the
amdgpu_dm_update_cursor function. Previously, 'afb' was assumed to be
null at line 8388, 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.c:8433 amdgpu_dm_update_cursor()
	error: we previously assumed 'afb' could be null (see line 8388)
Comment 1 Robb Gatica 2024-10-21 21:56:15 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024102121-CVE-2024-49908-a7fe@gregkh/T