CVE-2026-53058

Description

In 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.

References

• https://git.kernel.org/stable/c/1af3b42e08a957e53bab8e1897393fe0a27d9fbf
• https://git.kernel.org/stable/c/43d6508ddbf9fb974fbc359a033154f78c9d4c8b
• https://git.kernel.org/stable/c/5302015daf26ef6b48e067f2b86c9482ac19e015
• https://git.kernel.org/stable/c/a3611554e599d1a24b45fd8415bacb72ce861e4b
• https://git.kernel.org/stable/c/cf2ac2cac8b319f89b3a3851ca0c5ffb6a549575