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| author |   Boris Brezillon <boris.brezillon@collabora.com> | 2020-01-07 12:30:31 +0100 |
|---|---|---|
| committer | Boris Brezillon <boris.brezillon@collabora.com> | 2020-01-07 14:19:54 +0100 |
| commit | b18398c16e176513502f962b642f89225039ef1f (patch) | |
| tree | 2425c057a17c762c7491456e8aca9197196c8d13 /drivers/gpu/drm/drm_bridge.c | |
| parent | drm/mgag200: Add module parameter to pin all buffers at offset 0 (diff) | |
| download | linux-dev-b18398c16e176513502f962b642f89225039ef1f.tar.xz linux-dev-b18398c16e176513502f962b642f89225039ef1f.zip | |
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: b86d895524ab ("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
Diffstat (limited to 'drivers/gpu/drm/drm_bridge.c')
| -rw-r--r-- | drivers/gpu/drm/drm_bridge.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c index 37400607e9b7..32d43bfeeca1 100644 --- a/drivers/gpu/drm/drm_bridge.c +++ b/drivers/gpu/drm/drm_bridge.c @@ -938,15 +938,19 @@ 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; |