Fix memory leak

When the variant is invalid the shared is not destroyed.

We even can avoid the creation of the PrivateShared if we know the
variant is invalid

Reviewed-by: Thierry

2 files changed, 7 insertions, 4 deletions

diff --git a/src/corelib/kernel/qvariant.cpp b/src/corelib/kernel/qvariant.cpp
index a91fb75..9adfa57 100644
--- a/src/corelib/kernel/qvariant.cpp
+++ b/src/corelib/kernel/qvariant.cpp
@@ -174,10 +174,13 @@ static void construct(QVariant::Private *x, const void *copy)
     case QVariant::UserType:
         break;
     default:
-        x->is_shared = true;
-        x->data.shared = new QVariant::PrivateShared(QMetaType::construct(x->type, copy));
-        if (!x->data.shared->ptr)
+        void *ptr = QMetaType::construct(x->type, copy);
+        if (!ptr) {
             x->type = QVariant::Invalid;
+        } else {
+            x->is_shared = true;
+            x->data.shared = new QVariant::PrivateShared(ptr);
+        }
         break;
     }
     x->is_null = !copy;
diff --git a/tests/auto/qvariant/tst_qvariant.cpp b/tests/auto/qvariant/tst_qvariant.cpp
index 1722ad3..5ed0dcd 100644
--- a/tests/auto/qvariant/tst_qvariant.cpp
+++ b/tests/auto/qvariant/tst_qvariant.cpp
@@ -2622,7 +2622,7 @@ void tst_QVariant::qvariant_cast_QObject_data() {
 
     QTest::addColumn<QVariant>("data");
     QTest::addColumn<bool>("success");
-    QTest::newRow("from QObject") << QVariant(QMetaType::QObjectStar, new QObject) << true;
+    QTest::newRow("from QObject") << QVariant(QMetaType::QObjectStar, new QObject(this)) << true;
     QTest::newRow("from String") << QVariant(QLatin1String("1, 2, 3")) << false;
     QTest::newRow("from int") << QVariant((int) 123) << false;
 }