diff -r 3b1da2848fc7 -r d3bac044e0f0 src/corelib/tools/qbytearray.cpp
--- a/src/corelib/tools/qbytearray.cpp	Fri Feb 19 23:40:16 2010 +0200
+++ b/src/corelib/tools/qbytearray.cpp	Fri Mar 12 15:46:37 2010 +0200
@@ -561,6 +561,7 @@
             d->ref = 1;
             d->alloc = d->size = len;
             d->data = d->array;
+            d->array[len] = 0;
 
             return QByteArray(d.take(), 0, 0);