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

[Vinson Lee]

Module: Mesa
Branch: master
Commit: 689249bcbe96e2655aac29569ba36554bee1c503
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=689249bcbe96e2655aac29569ba36554bee1c503

Author: Vinson Lee <vlee at vmware.com>
Date:   Sat Feb 27 16:30:49 2010 -0800

mga: Add assert to check for null pointer dereference.

---

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

diff --git a/src/mesa/drivers/dri/mga/mgatexmem.c b/src/mesa/drivers/dri/mga/mgatexmem.c
index 47be6f3..58afbbb 100644
--- 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;