APPLIED: [SRU][F][PATCH 0/1] CVE-2021-47063

[Roxana Nicolescu]

On 19/04/2024 17:29, Bethany Jamison wrote:
> [Impact]
>
> 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.
>
> [Fix]
>
> Mantic:	not-affected
> Jammy:	not-affected
> Focal:	Backport - I accepted the incoming fix change, the context
> 	conflict was because the contents of 'panel_bridge_detach'
> 	were removed in a commit that can't be applied to Focal and
> 	then the fix commit refilled in the contents of the function.
> Bionic:	fix sent to esm ML
> Xenial:	not-affected
> Trusty:	not-affected
>
> [Test Case]
>
> Compile and boot tested.
>
> [Where problems could occur]
>
> This fix affects those who use DRM when detaching bridges, an issue
> with this fix would be visable via data corruption, as well as
> potentially a system crash.
>
> Paul Cercueil (1):
>    drm: bridge/panel: Cleanup connector on bridge detach
>
>   drivers/gpu/drm/bridge/panel.c | 11 ++++++++++-
>   1 file changed, 10 insertions(+), 1 deletion(-)
>
Applied to focal master-next branch. Thanks!