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drm/atomic: Fix potential use of state after free 

The atomic helpers rely on drm_atomic_state_clear() to reset an atomic
state if a retry is needed due to the w/w mutexes. The subsequent calls
to drm_atomic_get_{crtc,plane,...}_state() would then return the stale
pointers in state->{crtc,plane,...}_states.

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 2015-01-23 09:27:59 +02:00 committed by Daniel Vetter
parent 95d6eb3b13
commit 9469244d86
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->connector_states[i] = NULL;
}
for (i = 0; i < config->num_crtc; i++) {
@ -144,6 +145,7 @@ void drm_atomic_state_clear(struct drm_atomic_state *state)
crtc->funcs->atomic_destroy_state(crtc,
state->crtc_states[i]);
state->crtc_states[i] = NULL;
}
for (i = 0; i < config->num_total_plane; i++) {
@ -154,6 +156,7 @@ void drm_atomic_state_clear(struct drm_atomic_state *state)
plane->funcs->atomic_destroy_state(plane,
state->plane_states[i]);
state->plane_states[i] = NULL;
}
}
EXPORT_SYMBOL(drm_atomic_state_clear);