Bug 2348202 (CVE-2021-47659)

Summary: CVE-2021-47659 kernel: drm/plane: Move range check for format_count earlier
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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Description OSIDB Bzimport 2025-02-26 03:21:10 UTC 
In the Linux kernel, the following vulnerability has been resolved:

drm/plane: Move range check for format_count earlier

While the check for format_count > 64 in __drm_universal_plane_init()
shouldn't be hit (it's a WARN_ON), in its current position it will then
leak the plane->format_types array and fail to call
drm_mode_object_unregister() leaking the modeset identifier. Move it to
the start of the function to avoid allocating those resources in the
first place.
Comment 1 Avinash Hanwate 2025-02-26 14:26:53 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025022652-CVE-2021-47659-ba18@gregkh/T
Comment 4 Avinash Hanwate 2025-02-26 18:25:33 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025022652-CVE-2021-47659-ba18@gregkh/T