From: Vinson Lee <vlee@vmware.com>
Date: Tue, 24 Nov 2009 05:57:55 +0000 (-0500)
Subject: dri: Fix potential null pointer deference in dri_put_drawable.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=f622b649fb0c55b1640997f9d32ea327743519a1;p=mesa.git

dri: Fix potential null pointer deference in dri_put_drawable.
(cherry picked from commit 364070b1f2b08d43fb205ec198894a35bec6b2f3)
---

diff --git a/src/mesa/drivers/dri/common/dri_util.c b/src/mesa/drivers/dri/common/dri_util.c
index e48e10d7c06..439f66a7b88 100644
--- a/src/mesa/drivers/dri/common/dri_util.c
+++ b/src/mesa/drivers/dri/common/dri_util.c
@@ -498,11 +498,11 @@ static void dri_put_drawable(__DRIdrawable *pdp)
 {
     __DRIscreenPrivate *psp;
 
-    pdp->refcount--;
-    if (pdp->refcount)
-	return;
-
     if (pdp) {
+	pdp->refcount--;
+	if (pdp->refcount)
+	    return;
+
 	psp = pdp->driScreenPriv;
         (*psp->DriverAPI.DestroyBuffer)(pdp);
 	if (pdp->pClipRects) {