QQmlVMEMetaObjectEndpoint: ensure property cache before accessing it

Otherwise the property cache might be null and lead to segmentation
faults, e.g. when declaring aliases in qml.

Fixes: QTBUG-106256
Change-Id: I568c973e1ba00531fbe22a41e2c6c3c09dfc2f02
Pick-to: 6.2 6.3 6.4 5.15
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>

1 files changed, 20 insertions, 0 deletions

diff --git a/tests/auto/qml/qqmllanguage/tst_qqmllanguage.cpp b/tests/auto/qml/qqmllanguage/tst_qqmllanguage.cpp
index 44043ad02e..2bed1dc930 100644
--- a/tests/auto/qml/qqmllanguage/tst_qqmllanguage.cpp
+++ b/tests/auto/qml/qqmllanguage/tst_qqmllanguage.cpp
@@ -393,6 +393,7 @@ private slots:
     void v4SequenceMethodsWithParams_data();
     void v4SequenceMethodsWithParams();
     void jsFunctionOverridesImport();
+    void bindingAliasToComponentUrl();
 
 private:
     QQmlEngine engine;
@@ -7605,6 +7606,25 @@ void tst_qqmllanguage::jsFunctionOverridesImport()
     QCOMPARE(object->objectName(), u"foo"_s);
 }
 
+void tst_qqmllanguage::bindingAliasToComponentUrl()
+{
+    QQmlEngine engine;
+    {
+        QQmlComponent component(&engine, testFileUrl("bindingAliasToComponentUrl.qml"));
+        QVERIFY2(component.isReady(), qPrintable(component.errorString()));
+        QScopedPointer<QObject> object(component.create());
+        QVERIFY(object);
+        QCOMPARE(object->property("accessibleNormalUrl"), object->property("urlClone"));
+    }
+    {
+        QQmlComponent component(&engine, testFileUrl("bindingAliasToComponentUrl2.qml"));
+        QVERIFY2(component.isReady(), qPrintable(component.errorString()));
+        QScopedPointer<QObject> object(component.create());
+        QVERIFY(object);
+        QCOMPARE(object->property("accessibleNormalProgress"), QVariant(1.0));
+    }
+}
+
 QTEST_MAIN(tst_qqmllanguage)
 
 #include "tst_qqmllanguage.moc"