Index: xorg-server-1.13.2/glx/glxdri.c
===================================================================
--- xorg-server-1.13.2/glx/glxdri.c
+++ xorg-server-1.13.2/glx/glxdri.c
@@ -971,13 +971,15 @@ __glXDRIscreenProbe(ScreenPtr pScreen)
     size_t buffer_size;
     ScrnInfoPtr pScrn = xf86ScreenToScrn(pScreen);
 
+    framebuffer.base = NULL;
+
     if (!xf86LoaderCheckSymbol("DRIQueryDirectRenderingCapable") ||
         !DRIQueryDirectRenderingCapable(pScreen, &isCapable) || !isCapable) {
         LogMessage(X_INFO,
                    "AIGLX: Screen %d is not DRI capable\n", pScreen->myNum);
         return NULL;
     }
-
+   
     screen = calloc(1, sizeof *screen);
     if (screen == NULL)
         return NULL;