drm/r600: fix possible NULL pointer derefernce

Reported-by: Alexander Y. Fomichev <git.user@gmail.com>
Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/drivers/gpu/drm/radeon/r600_blit.c b/drivers/gpu/drm/radeon/r600_blit.c
index f4fb88ece2bb..ca5c29f70779 100644
--- a/drivers/gpu/drm/radeon/r600_blit.c
+++ b/drivers/gpu/drm/radeon/r600_blit.c
@@ -538,9 +538,12 @@ int
 r600_prepare_blit_copy(struct drm_device *dev, struct drm_file *file_priv)
 {
         drm_radeon_private_t *dev_priv = dev->dev_private;
+        int ret;
         DRM_DEBUG("\n");
 
-        r600_nomm_get_vb(dev);
+        ret = r600_nomm_get_vb(dev);
+        if (ret)
+                return ret;
 
         dev_priv->blit_vb->file_priv = file_priv;