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

2 files changed, 10 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;
diff --git a/tests/auto/qmetatype/tst_qmetatype.cpp b/tests/auto/qmetatype/tst_qmetatype.cpp
index f4e122f..8558e06 100644
--- a/tests/auto/qmetatype/tst_qmetatype.cpp
+++ b/tests/auto/qmetatype/tst_qmetatype.cpp
@@ -77,6 +77,7 @@ private slots:
     void isRegistered_data();
     void isRegistered();
     void unregisterType();
+    void QTBUG11316_registerStreamBuiltin();
 
 };
 
@@ -318,5 +319,12 @@ void tst_QMetaType::unregisterType()
     QCOMPARE(QMetaType::isRegistered(typeId), false);
 }
 
+void tst_QMetaType::QTBUG11316_registerStreamBuiltin()
+{
+    //should not crash;
+    qRegisterMetaTypeStreamOperators<QString>("QString");
+    qRegisterMetaTypeStreamOperators<QVariant>("QVariant");
+}
+
 QTEST_MAIN(tst_QMetaType)
 #include "tst_qmetatype.moc"