Bug 2320538 (CVE-2024-49909)

Summary: CVE-2024-49909 kernel: drm/amd/display: Add NULL check for function pointer in dcn32_set_output_transfer_func
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: 2321058    
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Description OSIDB Bzimport 2024-10-21 19:09:14 UTC 
In the Linux kernel, the following vulnerability has been resolved:

drm/amd/display: Add NULL check for function pointer in dcn32_set_output_transfer_func

This commit adds a null check for the set_output_gamma function pointer
in the dcn32_set_output_transfer_func function. Previously,
set_output_gamma was being checked for null, but then it was being
dereferenced without any null check. This could lead to a null pointer
dereference if set_output_gamma is null.

To fix this, we now ensure that set_output_gamma is not null before
dereferencing it. We do this by adding a null check for set_output_gamma
before the call to set_output_gamma.
Comment 1 Robb Gatica 2024-10-22 16:46:13 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024102121-CVE-2024-49909-5d54@gregkh/T