[PATCH] drm/i915: Handle null 'fb' in 'intel_plane_atomic_check_with_state'

[Lu Yao]

Add null pointer check before use fb.
Reported by smatch.

Signed-off-by: Lu Yao <yaolu at kylinos.cn>
---
 drivers/gpu/drm/i915/display/intel_atomic_plane.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_atomic_plane.c b/drivers/gpu/drm/i915/display/intel_atomic_plane.c
index d89630b2d5c1..20bfa9589ee7 100644
--- a/drivers/gpu/drm/i915/display/intel_atomic_plane.c
+++ b/drivers/gpu/drm/i915/display/intel_atomic_plane.c
@@ -640,18 +640,18 @@ int intel_plane_atomic_check_with_state(const struct intel_crtc_state *old_crtc_
 	    intel_plane_is_scaled(new_plane_state))
 		new_crtc_state->scaled_planes |= BIT(plane->id);
 
-	if (new_plane_state->uapi.visible &&
+	if (fb && new_plane_state->uapi.visible &&
 	    intel_format_info_is_yuv_semiplanar(fb->format, fb->modifier))
 		new_crtc_state->nv12_planes |= BIT(plane->id);
 
-	if (new_plane_state->uapi.visible &&
+	if (fb && new_plane_state->uapi.visible &&
 	    fb->format->format == DRM_FORMAT_C8)
 		new_crtc_state->c8_planes |= BIT(plane->id);
 
 	if (new_plane_state->uapi.visible || old_plane_state->uapi.visible)
 		new_crtc_state->update_planes |= BIT(plane->id);
 
-	if (new_plane_state->uapi.visible &&
+	if (fb && new_plane_state->uapi.visible &&
 	    intel_format_info_is_yuv_semiplanar(fb->format, fb->modifier)) {
 		new_crtc_state->data_rate_y[plane->id] =
 			intel_plane_data_rate(new_crtc_state, new_plane_state, 0);
-- 
2.25.1