Bug 2311712 (CVE-2024-45015)

Summary: CVE-2024-45015 kernel: drm/msm/dpu: move dpu_encoder's connector assignment to atomic_enable()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
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Hardware: All   
OS: Linux   
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Bug Depends On: 2311745    
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Description OSIDB Bzimport 2024-09-11 16:20:55 UTC 
In the Linux kernel, the following vulnerability has been resolved:

drm/msm/dpu: move dpu_encoder's connector assignment to atomic_enable()

For cases where the crtc's connectors_changed was set without enable/active
getting toggled , there is an atomic_enable() call followed by an
atomic_disable() but without an atomic_mode_set().

This results in a NULL ptr access for the dpu_encoder_get_drm_fmt() call in
the atomic_enable() as the dpu_encoder's connector was cleared in the
atomic_disable() but not re-assigned as there was no atomic_mode_set() call.

Fix the NULL ptr access by moving the assignment for atomic_enable() and also
use drm_atomic_get_new_connector_for_encoder() to get the connector from
the atomic_state.

Patchwork: https://patchwork.freedesktop.org/patch/606729/
Comment 1 Michal Findra 2024-09-11 17:02:18 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024091107-CVE-2024-45015-c139@gregkh/T