mga: Add assert to check for null pointer dereference.

diff --git a/src/mesa/drivers/dri/mga/mgatexmem.c b/src/mesa/drivers/dri/mga/mgatexmem.c
index 47be6f3..58afbbb 100644 (file)
--- a/src/mesa/drivers/dri/mga/mgatexmem.c
+++ b/src/mesa/drivers/dri/mga/mgatexmem.c
@@ -222,6 +222,7 @@ int mgaUploadTexImages( mgaContextPtr mmesa, mgaTextureObjectPtr t )
         return -1;
       }
 
+      assert(t->base.memBlock);
       ofs = mmesa->mgaScreen->textureOffset[ heap ]
           + t->base.memBlock->ofs;