Hi Boris,
Thank you for the patch.
On Tue, Jan 07, 2020 at 12:30:31PM +0100, Boris Brezillon wrote:
> drm_atomic_bridge_chain_check() callers can pass a NULL bridge. Let's
> bail out before derefencing the bridge pointer when that happens.
>
> Reported-by: Chris Wilson <ch...@chris-wilson.co.uk>
> Fixes: b86d895524ab ("drm/bridge: Add an ->atomic_check() hook")
> Signed-off-by: Boris Brezillon <boris.brezil...@collabora.com>
Reviewed-by: Laurent Pinchart <laurent.pinch...@ideasonboard.com>
> ---
> drivers/gpu/drm/drm_bridge.c | 6 +++++-
> 1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c
> index da28967bc586..f6f020854e83 100644
> --- a/drivers/gpu/drm/drm_bridge.c
> +++ b/drivers/gpu/drm/drm_bridge.c
> @@ -941,15 +941,19 @@ int drm_atomic_bridge_chain_check(struct drm_bridge
> *bridge,
> struct drm_connector_state *conn_state)
> {
> struct drm_connector *conn = conn_state->connector;
> - struct drm_encoder *encoder = bridge->encoder;
> + struct drm_encoder *encoder;
> struct drm_bridge *iter;
> int ret;
>
> + if (!bridge)
> + return 0;
> +
> ret = drm_atomic_bridge_chain_select_bus_fmts(bridge, crtc_state,
> conn_state);
> if (ret)
> return ret;
>
> + encoder = bridge->encoder;
> list_for_each_entry_reverse(iter, &encoder->bridge_chain, chain_node) {
> int ret;
>
--
Regards,
Laurent Pinchart
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