Bug 2320498 (CVE-2024-49913)

Summary: CVE-2024-49913 kernel: drm/amd/display: Add null check for top_pipe_to_program in commit_planes_for_stream
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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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: 2320979    
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Description OSIDB Bzimport 2024-10-21 19:06:01 UTC 
In the Linux kernel, the following vulnerability has been resolved:

drm/amd/display: Add null check for top_pipe_to_program in commit_planes_for_stream

This commit addresses a null pointer dereference issue in the
`commit_planes_for_stream` function at line 4140. The issue could occur
when `top_pipe_to_program` is null.

The fix adds a check to ensure `top_pipe_to_program` is not null before
accessing its stream_res. This prevents a null pointer dereference.

Reported by smatch:
drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc.c:4140 commit_planes_for_stream() error: we previously assumed 'top_pipe_to_program' could be null (see line 3906)
Comment 1 Michal Findra 2024-10-22 13:11:42 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024102122-CVE-2024-49913-229b@gregkh/T