Bug 2347756 (CVE-2022-49137)

Summary: CVE-2022-49137 kernel: drm/amd/amdgpu/amdgpu_cs: fix refcount leak of a dma_fence obj
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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Description OSIDB Bzimport 2025-02-26 03:05:38 UTC 
In the Linux kernel, the following vulnerability has been resolved:

drm/amd/amdgpu/amdgpu_cs: fix refcount leak of a dma_fence obj

This issue takes place in an error path in
amdgpu_cs_fence_to_handle_ioctl(). When `info->in.what` falls into
default case, the function simply returns -EINVAL, forgetting to
decrement the reference count of a dma_fence obj, which is bumped
earlier by amdgpu_cs_get_fence(). This may result in reference count
leaks.

Fix it by decreasing the refcount of specific object before returning
the error code.
Comment 1 Avinash Hanwate 2025-02-26 13:52:16 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025022606-CVE-2022-49137-92fc@gregkh/T
Comment 4 Avinash Hanwate 2025-02-26 17:56:31 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025022606-CVE-2022-49137-92fc@gregkh/T