Bug 2327330 (CVE-2024-53056)

Summary: CVE-2024-53056 kernel: drm/mediatek: Fix potential NULL dereference in mtk_crtc_destroy()
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: 2327492    
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Description OSIDB Bzimport 2024-11-19 18:01:15 UTC 
In the Linux kernel, the following vulnerability has been resolved:

drm/mediatek: Fix potential NULL dereference in mtk_crtc_destroy()

In mtk_crtc_create(), if the call to mbox_request_channel() fails then we
set the "mtk_crtc->cmdq_client.chan" pointer to NULL.  In that situation,
we do not call cmdq_pkt_create().

During the cleanup, we need to check if the "mtk_crtc->cmdq_client.chan"
is NULL first before calling cmdq_pkt_destroy().  Calling
cmdq_pkt_destroy() is unnecessary if we didn't call cmdq_pkt_create() and
it will result in a NULL pointer dereference.
Comment 1 Robb Gatica 2024-11-19 21:32:31 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024111928-CVE-2024-53056-ae69@gregkh/T