QMetaType: do not crash when registering builtin stream operator

It is not required to register builtin operator, but old code might
do so if a type was not builtin before.
This is the case of QVariant which became builtin only in Qt 4.7

Task-number: QTBUG-11316
Reviewed-by: Gabriel

1 files changed, 2 insertions, 0 deletions

diff --git a/src/corelib/kernel/qmetatype.cpp b/src/corelib/kernel/qmetatype.cpp
index ce9ed58..6ebaaa3 100644
--- a/src/corelib/kernel/qmetatype.cpp
+++ b/src/corelib/kernel/qmetatype.cpp
@@ -378,6 +378,8 @@ void QMetaType::registerStreamOperators(const char *typeName, SaveOperator saveO
 void QMetaType::registerStreamOperators(int idx, SaveOperator saveOp,
                                         LoadOperator loadOp)
 {
+    if (idx < User)
+        return; //builtin types should not be registered;
     QVector<QCustomTypeInfo> *ct = customTypes();
     if (!ct)
         return;