drm/nouveau/kms/nv50: add null check before pointer dereference

Add null check before dereferencing pointer asyc

Addresses-Coverity-ID: 1397932
Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

diff --git a/drivers/gpu/drm/nouveau/nv50_display.c b/drivers/gpu/drm/nouveau/nv50_display.c
index a7663249b3baf2df1c5c75d87d3b32109984ba97..06e564a9ccb253b3018b45d2f0a96cc53430ab2c 100644 (file)
--- a/drivers/gpu/drm/nouveau/nv50_display.c
+++ b/drivers/gpu/drm/nouveau/nv50_display.c
@@ -2107,7 +2107,8 @@ nv50_head_atomic_check(struct drm_crtc *crtc, struct drm_crtc_state *state)
                                        asyc->set.dither = true;
                        }
                } else {
-                       asyc->set.mask = ~0;
+                       if (asyc)
+                               asyc->set.mask = ~0;
                        asyh->set.mask = ~0;
                }