diff -r dee5afe5301f -r 3f74d0d4af4c src/gui/painting/qdrawhelper_p.h
--- a/src/gui/painting/qdrawhelper_p.h	Mon Mar 15 12:43:09 2010 +0200
+++ b/src/gui/painting/qdrawhelper_p.h	Thu Apr 08 14:19:33 2010 +0300
@@ -1549,6 +1549,9 @@
 template <class T>
 inline void qt_memfill(T *dest, T value, int count)
 {
+    if (!count)
+        return;
+
     int n = (count + 7) / 8;
     switch (count & 0x07)
     {