QML: Check for (valid) compilation units while hashing

When an error occurred while creating a compilation unit, the pointer
might be set to null. Subsequent use in hashing should check for this,
and not use a nullptr.

Change-Id: I62650917a740c9c1be29608285670153bed8703c
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>

3 files changed, 6 insertions, 0 deletions

diff --git a/tests/auto/qml/qqmllanguage/data/fuzzed.1.errors.txt b/tests/auto/qml/qqmllanguage/data/fuzzed.1.errors.txt
new file mode 100644
index 0000000000..e399799fe9
--- /dev/null
+++ b/tests/auto/qml/qqmllanguage/data/fuzzed.1.errors.txt
@@ -0,0 +1,2 @@
+2:8:Cannot assign to non-existent property "_G"
+
diff --git a/tests/auto/qml/qqmllanguage/data/fuzzed.1.qml b/tests/auto/qml/qqmllanguage/data/fuzzed.1.qml
new file mode 100644
index 0000000000..f80b9c3a2d
--- /dev/null
+++ b/tests/auto/qml/qqmllanguage/data/fuzzed.1.qml
@@ -0,0 +1,2 @@
+import QtQuick 2.4
+Item { _G.G.G:G }
diff --git a/tests/auto/qml/qqmllanguage/tst_qqmllanguage.cpp b/tests/auto/qml/qqmllanguage/tst_qqmllanguage.cpp
index f7198415a2..10af8d70e8 100644
--- a/tests/auto/qml/qqmllanguage/tst_qqmllanguage.cpp
+++ b/tests/auto/qml/qqmllanguage/tst_qqmllanguage.cpp
@@ -613,6 +613,8 @@ void tst_qqmllanguage::errors_data()
     QTest::newRow("badCompositeRegistration.1") << "badCompositeRegistration.1.qml" << "badCompositeRegistration.1.errors.txt" << false;
     QTest::newRow("badCompositeRegistration.2") << "badCompositeRegistration.2.qml" << "badCompositeRegistration.2.errors.txt" << false;
     QTest::newRow("cyclicAlias") << "cyclicAlias.qml" << "cyclicAlias.errors.txt" << false;
+
+    QTest::newRow("fuzzed.1") << "fuzzed.1.qml" << "fuzzed.1.errors.txt" << false;
 }