Bug 2320430 (CVE-2024-49914)

Summary: CVE-2024-49914 kernel: drm/amd/display: Add null check for pipe_ctx->plane_state in dcn20_program_pipe
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: 2320759    
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Description OSIDB Bzimport 2024-10-21 19:01:30 UTC 
In the Linux kernel, the following vulnerability has been resolved:

drm/amd/display: Add null check for pipe_ctx->plane_state in dcn20_program_pipe

This commit addresses a null pointer dereference issue in the
`dcn20_program_pipe` function. The issue could occur when
`pipe_ctx->plane_state` is null.

The fix adds a check to ensure `pipe_ctx->plane_state` is not null
before accessing. This prevents a null pointer dereference.

Reported by smatch:
drivers/gpu/drm/amd/amdgpu/../display/dc/hwss/dcn20/dcn20_hwseq.c:1925 dcn20_program_pipe() error: we previously assumed 'pipe_ctx->plane_state' could be null (see line 1877)
Comment 1 Robb Gatica 2024-10-21 21:53:25 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024102122-CVE-2024-49914-477e@gregkh/T