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drm/atomic: Clear crtcs, connectors and planes when clearing state

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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-devel@lists.freedesktop.org
Signed-off-by: Ander Conselvan de Oliveira <ander.conselvan.de.oliveira@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Ander Conselvan de Oliveira 2015-03-30 10:41:19 +03:00 committed by Daniel Vetter
parent 7ef5f82b10
commit 8a5c0bde54
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/drm_atomic.c
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@ -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;
}
}