Fix crash when trying to append a null transform to QDeclarativeItem.

Task-number: QTBUG-13893
(cherry picked from commit 085a121cb1ebba38d62c924500dbc71806b29b3c)

3 files changed, 26 insertions, 1 deletions

diff --git a/src/declarative/graphicsitems/qdeclarativeitem.cpp b/src/declarative/graphicsitems/qdeclarativeitem.cpp
index e9da4f7..230169d 100644
--- a/src/declarative/graphicsitems/qdeclarativeitem.cpp
+++ b/src/declarative/graphicsitems/qdeclarativeitem.cpp
@@ -1705,7 +1705,7 @@ int QDeclarativeItemPrivate::transform_count(QDeclarativeListProperty<QGraphicsT
 void QDeclarativeItemPrivate::transform_append(QDeclarativeListProperty<QGraphicsTransform> *list, QGraphicsTransform *item)
 {
     QGraphicsObject *object = qobject_cast<QGraphicsObject *>(list->object);
-    if (object) // QGraphicsItem applies the list in the wrong order, so we prepend.
+    if (object && item) // QGraphicsItem applies the list in the wrong order, so we prepend.
         QGraphicsItemPrivate::get(object)->prependGraphicsTransform(item);
 }
 
diff --git a/tests/auto/declarative/qdeclarativeitem/data/transformCrash.qml b/tests/auto/declarative/qdeclarativeitem/data/transformCrash.qml
new file mode 100644
index 0000000..ab7fa84
--- /dev/null
+++ b/tests/auto/declarative/qdeclarativeitem/data/transformCrash.qml
@@ -0,0 +1,13 @@
+import Qt 4.7
+
+Item {
+    id: wrapper
+    width: 200
+    height: 200
+
+    QtObject {
+        id: object
+    }
+
+    Component.onCompleted: wrapper.transform = object
+}
diff --git a/tests/auto/declarative/qdeclarativeitem/tst_qdeclarativeitem.cpp b/tests/auto/declarative/qdeclarativeitem/tst_qdeclarativeitem.cpp
index 25ca157..6b28c53 100644
--- a/tests/auto/declarative/qdeclarativeitem/tst_qdeclarativeitem.cpp
+++ b/tests/auto/declarative/qdeclarativeitem/tst_qdeclarativeitem.cpp
@@ -81,6 +81,8 @@ private slots:
     void resourcesProperty();
     void mouseFocus();
 
+    void transformCrash();
+
 private:
     template<typename T>
     T *findItem(QGraphicsObject *parent, const QString &objectName);
@@ -792,6 +794,16 @@ void tst_QDeclarativeItem::childrenRectBug3()
     delete canvas;
 }
 
+// QTBUG-13893
+void tst_QDeclarativeItem::transformCrash()
+{
+    QDeclarativeView *canvas = new QDeclarativeView(0);
+    canvas->setSource(QUrl::fromLocalFile(SRCDIR "/data/transformCrash.qml"));
+    canvas->show();
+
+    delete canvas;
+}
+
 template<typename T>
 T *tst_QDeclarativeItem::findItem(QGraphicsObject *parent, const QString &objectName)
 {