QML: Check result when constructing object from metaobject

If you pass insufficient arguments to call the ctor, the resulting
object is null and cannot be used.

Pick-to: 6.6 6.5 6.2
Fixes: QTBUG-114910
Change-Id: Ib184684b6a7665bcdc1a3fe8f8a2401a33a8ac1c
Reviewed-by: Semih Yavuz <[email protected]>
Reviewed-by: Fabian Kosmale <[email protected]>

1 files changed, 5 insertions, 3 deletions

diff --git a/src/qml/jsruntime/qv4qobjectwrapper.cpp b/src/qml/jsruntime/qv4qobjectwrapper.cpp
index 38b9226c9f..14a4c67f96 100644
--- a/src/qml/jsruntime/qv4qobjectwrapper.cpp
+++ b/src/qml/jsruntime/qv4qobjectwrapper.cpp
@@ -2786,9 +2786,11 @@ ReturnedValue QMetaObjectWrapper::constructInternal(const Value *argv, int argc)
                     objectOrGadget, d()->constructors, d()->constructorCount, v4, callData)) {
         object = CallPrecise(objectOrGadget, *ctor, v4, callData, QMetaObject::CreateInstance);
     }
-    Scoped<QMetaObjectWrapper> metaObject(scope, this);
-    object->defineDefaultProperty(v4->id_constructor(), metaObject);
-    object->setPrototypeOf(const_cast<QMetaObjectWrapper*>(this));
+    if (object) {
+        Scoped<QMetaObjectWrapper> metaObject(scope, this);
+        object->defineDefaultProperty(v4->id_constructor(), metaObject);
+        object->setPrototypeOf(const_cast<QMetaObjectWrapper*>(this));
+    }
     return object.asReturnedValue();
 
 }