Bug 2324552 (CVE-2024-50174)

Summary: CVE-2024-50174 kernel: drm/panthor: Fix race when converting group handle to group object
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
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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Bug Depends On: 2324699    
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Description OSIDB Bzimport 2024-11-08 13:44:59 UTC 
In the Linux kernel, the following vulnerability has been resolved:

drm/panthor: Fix race when converting group handle to group object

XArray provides it's own internal lock which protects the internal array
when entries are being simultaneously added and removed. However there
is still a race between retrieving the pointer from the XArray and
incrementing the reference count.

To avoid this race simply hold the internal XArray lock when
incrementing the reference count, this ensures there cannot be a racing
call to xa_erase().
Comment 1 Robb Gatica 2024-11-08 15:41:06 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024110806-CVE-2024-50174-a1aa@gregkh/T