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.
Product status
c932ced6b58524eeb948ff252f6512cd6bcb9d9f (git) before 5302015daf26ef6b48e067f2b86c9482ac19e015
c932ced6b58524eeb948ff252f6512cd6bcb9d9f (git) before a3611554e599d1a24b45fd8415bacb72ce861e4b
c932ced6b58524eeb948ff252f6512cd6bcb9d9f (git) before cf2ac2cac8b319f89b3a3851ca0c5ffb6a549575
c932ced6b58524eeb948ff252f6512cd6bcb9d9f (git) before 1af3b42e08a957e53bab8e1897393fe0a27d9fbf
c932ced6b58524eeb948ff252f6512cd6bcb9d9f (git) before 43d6508ddbf9fb974fbc359a033154f78c9d4c8b
6.6
Any version before 6.6
6.6.141 (semver)
6.12.91 (semver)
6.18.33 (semver)
7.0.10 (semver)
7.1 (original_commit_for_fix)
References
git.kernel.org/...c/5302015daf26ef6b48e067f2b86c9482ac19e015
git.kernel.org/...c/a3611554e599d1a24b45fd8415bacb72ce861e4b
git.kernel.org/...c/cf2ac2cac8b319f89b3a3851ca0c5ffb6a549575
git.kernel.org/...c/1af3b42e08a957e53bab8e1897393fe0a27d9fbf
git.kernel.org/...c/43d6508ddbf9fb974fbc359a033154f78c9d4c8b