--- xorg-server-1.12.1/dix/getevents.c	2012-03-31 09:45:56.000000000 +0700
+++ ./getevents.c	2012-04-26 18:08:22.200564000 +0700
@@ -1435,7 +1435,7 @@
     if ((incr > 0 && delta < 0) || (incr < 0 && delta > 0))
         b--;                    /* we're scrolling up or left → button 4 or 6 */
 
-    while (fabs(delta) >= fabs(incr)) {
+    while ((fabs(delta) >= fabs(incr)) && ((num_events + 4) < max_events)) {
         int nev_tmp;
 
         if (delta > 0)