From d59c95bfae0402813a6b9a1242cdd971624c127a Mon Sep 17 00:00:00 2001
From: Michel Daenzer <daenzer@localhost.(none)>
Date: Fri, 14 Sep 2007 15:51:00 +0100
Subject: intel_winsys: Fix intel_buffer_reference.

Correctly clear the pointer to the old buffer (not sure how this could build at
all before...) and only reference the new one when its pointer is non-NULL.
---
 src/mesa/drivers/dri/intel_winsys/intel_winsys_pipe.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/mesa/drivers/dri/intel_winsys/intel_winsys_pipe.c b/src/mesa/drivers/dri/intel_winsys/intel_winsys_pipe.c
index 668bedcbda..2b2731446d 100644
--- a/src/mesa/drivers/dri/intel_winsys/intel_winsys_pipe.c
+++ b/src/mesa/drivers/dri/intel_winsys/intel_winsys_pipe.c
@@ -91,11 +91,13 @@ intel_buffer_reference(struct pipe_winsys *sws,
 {
    if (*ptr) {
       driBOUnReference( dri_bo(*ptr) );
-      *buf = NULL;
+      *ptr = NULL;
    }
 
-   driBOReference( dri_bo(buf) );
-   *ptr = buf;
+   if (buf) {
+      driBOReference( dri_bo(buf) );
+      *ptr = buf;
+   }
 }
 
 
-- 
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