[Intel-gfx] [PATCH v2] drm/i915: Fix possible NULL pointer dereferences in i9xx_update_wm()

[Harish Chegondi <harish.chegondi@intel.com>]

Check return pointer from intel_crtc_for_plane() before dereferencing
it, as it can be NULL.

v2: Moved the NULL check into intel_crtc_active().

Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Caz Yokoyama <caz.yokoyama@intel.com>
Cc: Radhakrishna Sripada <radhakrishna.sripada@intel.com>
Signed-off-by: Harish Chegondi <harish.chegondi@intel.com>
---
 drivers/gpu/drm/i915/intel_pm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index bdf97a8c9ef3..8b357ec35a4a 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -877,7 +877,7 @@ static bool intel_crtc_active(struct intel_crtc *crtc)
 	 * crtc->state->active once we have proper CRTC states wired up
 	 * for atomic.
 	 */
-	return crtc->active && crtc->base.primary->state->fb &&
+	return crtc && crtc->active && crtc->base.primary->state->fb &&
 		crtc->config->hw.adjusted_mode.crtc_clock;
 }
 
-- 
2.31.1