Mesa (master): r128: Add assert to check for null pointer dereference.

[Vinson Lee]

Module: Mesa
Branch: master
Commit: a5406444aeeef40c899a4159a1fae6d1501bc1cb
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=a5406444aeeef40c899a4159a1fae6d1501bc1cb

Author: Vinson Lee <vlee at vmware.com>
Date:   Sat Feb 27 16:28:30 2010 -0800

r128: Add assert to check for null pointer dereference.

---

 src/mesa/drivers/dri/r128/r128_texmem.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/src/mesa/drivers/dri/r128/r128_texmem.c b/src/mesa/drivers/dri/r128/r128_texmem.c
index 5eec8c0..412f6d4 100644
--- 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;