svga: Prevent potential null pointer dereference in vmw_surface.c.

2009-11-26 23:02:49 -05:00
parent 949d95e88a
commit 69671df74c
1 changed files with 5 additions and 3 deletions
@@ -37,11 +37,13 @@ vmw_svga_winsys_surface_reference(struct vmw_svga_winsys_surface **pdst,
 {
   struct pipe_reference *src_ref;
   struct pipe_reference *dst_ref;
-   struct vmw_svga_winsys_surface *dst = *pdst;
-   
+   struct vmw_svga_winsys_surface *dst;
+
   if(pdst == NULL || *pdst == src)
      return;
-   
+
+   dst = *pdst;
+
   src_ref = src ? &src->refcnt : NULL;
   dst_ref = dst ? &dst->refcnt : NULL;