CVE-2021-47063 Information

Description

In the Linux kernel the following vulnerability has been resolved:

drm: bridge/panel: Cleanup connector on bridge detach

If we don’t call drm_connector_cleanup() manually in panel_bridge_detach() the connector will be cleaned up with the other DRM objects in the call to drm_mode_config_cleanup(). However since our drm_connector is devm-allocated by the time drm_mode_config_cleanup() will be called our connector will be long gone. Therefore the connector must be cleaned up when the bridge is detached to avoid use-after-free conditions.

v2: Cleanup connector only if it was created

v3: Add FIXME

v4: (Use connector->dev) directly in if() block

Reference

https://git.kernel.org/stable/c/ce450934a00cf896e648fde08d0bd1426653d7a2 https://git.kernel.org/stable/c/18149b420c9bd93c443e8d1f48a063d71d9f6aa1 https://git.kernel.org/stable/c/98d7d76a74e48ec3ddf2e23950adff7edcab9327 https://git.kernel.org/stable/c/4d906839d321c2efbf3fed4bc31ffd9ff55b75c0