forked from Minki/linux
drm/bridge: Fix a NULL pointer dereference in drm_atomic_bridge_chain_check()
drm_atomic_bridge_chain_check() callers can pass a NULL bridge. Let's
bail out before dereferencing the bridge pointer when that happens.
Reported-by: Chris Wilson <chris@chris-wilson.co.uk>
Fixes: b86d895524
("drm/bridge: Add an ->atomic_check() hook")
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20200107113031.435604-1-boris.brezillon@collabora.com
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@ -938,15 +938,19 @@ int drm_atomic_bridge_chain_check(struct drm_bridge *bridge,
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struct drm_connector_state *conn_state)
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{
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struct drm_connector *conn = conn_state->connector;
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struct drm_encoder *encoder = bridge->encoder;
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struct drm_encoder *encoder;
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struct drm_bridge *iter;
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int ret;
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if (!bridge)
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return 0;
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ret = drm_atomic_bridge_chain_select_bus_fmts(bridge, crtc_state,
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conn_state);
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if (ret)
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return ret;
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encoder = bridge->encoder;
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list_for_each_entry_reverse(iter, &encoder->bridge_chain, chain_node) {
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int ret;
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