drm/bridge: cadence: cdns-mhdp8546-core: Set the mhdp connector earlier in atomic_enable()

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Summary

CVECVE-2026-53058
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-24 17:17:18 UTC
Updated2026-06-24 17:17:18 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: drm/bridge: cadence: cdns-mhdp8546-core: Set the mhdp connector earlier in atomic_enable() In case if we get errors in cdns_mhdp_link_up() or cdns_mhdp_reg_read() in atomic_enable, we will go to cdns_mhdp_modeset_retry_fn() and will hit NULL pointer while trying to access the mutex. We need the connector to be set before that. Unlike in legacy cases with flag !DRM_BRIDGE_ATTACH_NO_CONNECTOR, we do not have connector initialised in bridge_attach(), so add the mhdp->connector_ptr in device structure to handle both cases with DRM_BRIDGE_ATTACH_NO_CONNECTOR and !DRM_BRIDGE_ATTACH_NO_CONNECTOR, set it in atomic_enable() earlier to avoid possible NULL pointer dereference in recovery paths like modeset_retry_fn() with the DRM_BRIDGE_ATTACH_NO_CONNECTOR flag set.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected c932ced6b58524eeb948ff252f6512cd6bcb9d9f 5302015daf26ef6b48e067f2b86c9482ac19e015 git Not specified
CNA Linux Linux affected c932ced6b58524eeb948ff252f6512cd6bcb9d9f a3611554e599d1a24b45fd8415bacb72ce861e4b git Not specified
CNA Linux Linux affected c932ced6b58524eeb948ff252f6512cd6bcb9d9f cf2ac2cac8b319f89b3a3851ca0c5ffb6a549575 git Not specified
CNA Linux Linux affected c932ced6b58524eeb948ff252f6512cd6bcb9d9f 1af3b42e08a957e53bab8e1897393fe0a27d9fbf git Not specified
CNA Linux Linux affected c932ced6b58524eeb948ff252f6512cd6bcb9d9f 43d6508ddbf9fb974fbc359a033154f78c9d4c8b git Not specified
CNA Linux Linux affected 6.6 Not specified
CNA Linux Linux unaffected 6.6 semver Not specified
CNA Linux Linux unaffected 6.6.141 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.91 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.33 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.10 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/5302015daf26ef6b48e067f2b86c9482ac19e015 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a3611554e599d1a24b45fd8415bacb72ce861e4b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/43d6508ddbf9fb974fbc359a033154f78c9d4c8b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1af3b42e08a957e53bab8e1897393fe0a27d9fbf 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/cf2ac2cac8b319f89b3a3851ca0c5ffb6a549575 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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