r128: Add assert to check for null pointer dereference.

diff --git a/src/mesa/drivers/dri/r128/r128_texmem.c b/src/mesa/drivers/dri/r128/r128_texmem.c
index 5eec8c0..412f6d4 100644 (file)
--- a/src/mesa/drivers/dri/r128/r128_texmem.c
+++ b/src/mesa/drivers/dri/r128/r128_texmem.c
@@ -260,6 +260,7 @@ void r128UploadTexImages( r128ContextPtr rmesa, r128TexObjPtr t )
       }
 
       /* Set the base offset of the texture image */
+      assert(t->base.memBlock);
       t->bufAddr = rmesa->r128Screen->texOffset[heap] 
           + t->base.memBlock->ofs;