Bug 2320485 (CVE-2024-49907)

Summary: CVE-2024-49907 kernel: drm/amd/display: Check null pointers before using dc->clk_mgr
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: 2320954    
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Description OSIDB Bzimport 2024-10-21 19:05:10 UTC 
In the Linux kernel, the following vulnerability has been resolved:

drm/amd/display: Check null pointers before using dc->clk_mgr

[WHY & HOW]
dc->clk_mgr is null checked previously in the same function, indicating
it might be null.

Passing "dc" to "dc->hwss.apply_idle_power_optimizations", which
dereferences null "dc->clk_mgr". (The function pointer resolves to
"dcn35_apply_idle_power_optimizations".)

This fixes 1 FORWARD_NULL issue reported by Coverity.
Comment 1 Michal Findra 2024-10-22 12:15:34 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024102121-CVE-2024-49907-d177@gregkh/T