Fix Flipable crash.

Task-number: QTBUG-9161

3 files changed, 23 insertions, 3 deletions

diff --git a/src/declarative/graphicsitems/qdeclarativeflipable.cpp b/src/declarative/graphicsitems/qdeclarativeflipable.cpp
index 1ebbaee..8b46039 100644
--- a/src/declarative/graphicsitems/qdeclarativeflipable.cpp
+++ b/src/declarative/graphicsitems/qdeclarativeflipable.cpp
@@ -42,6 +42,7 @@
 #include "qdeclarativeflipable_p.h"
 
 #include "qdeclarativeitem_p.h"
+#include "qdeclarativeguard_p.h"
 
 #include <qdeclarativeinfo.h>
 
@@ -58,8 +59,8 @@ public:
     void updateSceneTransformFromParent();
 
     QDeclarativeFlipable::Side current;
-    QDeclarativeItem *front;
-    QDeclarativeItem *back;
+    QDeclarativeGuard<QDeclarativeItem> front;
+    QDeclarativeGuard<QDeclarativeItem> back;
 };
 
 /*!
@@ -192,7 +193,7 @@ void QDeclarativeFlipablePrivate::updateSceneTransformFromParent()
 
     if (newSide != current) {
         current = newSide;
-        if (current == QDeclarativeFlipable::Back) {
+        if (current == QDeclarativeFlipable::Back && back) {
             QTransform mat;
             mat.translate(back->width()/2,back->height()/2);
             if (back->width() && p1.x() >= p2.x())
diff --git a/tests/auto/declarative/qdeclarativeflipable/data/crash.qml b/tests/auto/declarative/qdeclarativeflipable/data/crash.qml
new file mode 100644
index 0000000..ad40bf0
--- /dev/null
+++ b/tests/auto/declarative/qdeclarativeflipable/data/crash.qml
@@ -0,0 +1,9 @@
+import Qt 4.6
+
+Flipable {
+   transform: Rotation {
+        axis.y: 1
+        axis.z: 0
+        angle: 180
+    }
+}
diff --git a/tests/auto/declarative/qdeclarativeflipable/tst_qdeclarativeflipable.cpp b/tests/auto/declarative/qdeclarativeflipable/tst_qdeclarativeflipable.cpp
index ed37c43..04c6710 100644
--- a/tests/auto/declarative/qdeclarativeflipable/tst_qdeclarativeflipable.cpp
+++ b/tests/auto/declarative/qdeclarativeflipable/tst_qdeclarativeflipable.cpp
@@ -41,6 +41,7 @@
 #include <qtest.h>
 #include <QtDeclarative/qdeclarativeengine.h>
 #include <QtDeclarative/qdeclarativecomponent.h>
+#include <QtDeclarative/qdeclarativeview.h>
 #include <private/qdeclarativeflipable_p.h>
 #include <private/qdeclarativevaluetype_p.h>
 #include <QFontMetrics>
@@ -57,6 +58,7 @@ private slots:
     void create();
     void checkFrontAndBack();
     void setFrontAndBack();
+    void crash();
 
 private:
     QDeclarativeEngine engine;
@@ -108,6 +110,14 @@ void tst_qdeclarativeflipable::setFrontAndBack()
     delete obj;
 }
 
+void tst_qdeclarativeflipable::crash()
+{
+    QDeclarativeView *canvas = new QDeclarativeView;
+    canvas->setSource(QUrl(SRCDIR "/data/crash.qml"));
+    canvas->show();
+    delete canvas;
+}
+
 QTEST_MAIN(tst_qdeclarativeflipable)
 
 #include "tst_qdeclarativeflipable.moc"