i810: Add assert to check for null pointer dereference.

diff --git a/src/mesa/drivers/dri/i810/i810texmem.c b/src/mesa/drivers/dri/i810/i810texmem.c
index bb426a4..6e6b21c 100644 (file)
--- a/src/mesa/drivers/dri/i810/i810texmem.c
+++ b/src/mesa/drivers/dri/i810/i810texmem.c
@@ -155,6 +155,7 @@ int i810UploadTexImagesLocked( i810ContextPtr imesa, i810TextureObjectPtr t )
        return -1;
       }
       
+      assert(t->base.memBlock);
       ofs = t->base.memBlock->ofs;
       t->BufAddr = imesa->i810Screen->tex.map + ofs;
       t->Setup[I810_TEXREG_MI3] = imesa->i810Screen->textureOffset + ofs;