drm/rockchip: dw_dp: Switch to drmm_kzalloc()

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Summary

CVECVE-2026-74421
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 06:22:44 UTC
Updated2026-08-15 06:22:44 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: drm/rockchip: dw_dp: Switch to drmm_kzalloc() Driver makes use of drmm_encoder_init() to initialize the encoder and automatically handle the cleanup by registering drm_encoder_cleanup() with drmm_add_action(). However, the internal structure containing the encoder part gets allocated with devm_kzalloc(), which happens while component_bind_all() is being called from Rockchip DRM driver. The component framework further ensures it is deallocated as part of releasing all the resources claimed during bind, which is triggered from component_unbind_all(). When the reference to the DRM device gets eventually dropped via drm_dev_put() in rockchip_drm_unbind(), drmm_encoder_alloc_release() attempts to access the now released encoder structure, leading to use-after-free. Ensure driver's internal structure is still reachable on encoder cleanup by switching from a device-managed allocation to a drm-managed one.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected d68ba7bac9555d05e2f5b310c898b2a5c7eff174 0d60b835bca42f0f790689dd47819ed881a92ccc git Not specified
CNA Linux Linux affected d68ba7bac9555d05e2f5b310c898b2a5c7eff174 6b0b92d1110eccccbd5ba2949bd2b9fb6ea5fc12 git Not specified
CNA Linux Linux affected d68ba7bac9555d05e2f5b310c898b2a5c7eff174 ed9da8d23020352ad24c528db09b5acdd78b81fd git Not specified
CNA Linux Linux affected 6.18 Not specified
CNA Linux Linux unaffected 6.18 semver Not specified
CNA Linux Linux unaffected 6.18.40 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/0d60b835bca42f0f790689dd47819ed881a92ccc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6b0b92d1110eccccbd5ba2949bd2b9fb6ea5fc12 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ed9da8d23020352ad24c528db09b5acdd78b81fd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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