Users of the atomic state assume that if the pointer to a crtc, plane or
connector is not NULL in the respective object vector, than the state
for that object in *_states vector also won't be NULL. That assumption
was broken by drm_atomic_state_clear(), which would clear the state
pointer but leave the pointer to the object still set.
This fixes a NULL pointer dereference in i915 caused by the use of
drm_atomic_state_clear().
Cc: dri-de...@lists.freedesktop.org
Signed-off-by: Ander Conselvan de Oliveira
<ander.conselvan.de.olive...@intel.com>
---
drivers/gpu/drm/drm_atomic.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
index 5d3abe3..00ea881 100644
--- a/drivers/gpu/drm/drm_atomic.c
+++ b/drivers/gpu/drm/drm_atomic.c
@@ -134,6 +134,7 @@ void drm_atomic_state_clear(struct drm_atomic_state *state)
connector->funcs->atomic_destroy_state(connector,
state->connector_states[i]);
+ state->connectors[i] = NULL;
state->connector_states[i] = NULL;
}
@@ -145,6 +146,7 @@ void drm_atomic_state_clear(struct drm_atomic_state *state)
crtc->funcs->atomic_destroy_state(crtc,
state->crtc_states[i]);
+ state->crtcs[i] = NULL;
state->crtc_states[i] = NULL;
}
@@ -156,6 +158,7 @@ void drm_atomic_state_clear(struct drm_atomic_state *state)
plane->funcs->atomic_destroy_state(plane,
state->plane_states[i]);
+ state->planes[i] = NULL;
state->plane_states[i] = NULL;
}
}
--
2.1.0
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