QSslConfiguration: fix crash when accessing null pointer

We were accessing the d-pointer of a QSslConfiguration which is
initialized lazily.

Reviewed-by: Markus Goetz
Task-number: QTBUG-13265
(cherry picked from commit d686a95ed54b19336affc14c9222de54c9af0e72)

2 files changed, 21 insertions, 0 deletions

diff --git a/src/network/ssl/qsslsocket.cpp b/src/network/ssl/qsslsocket.cpp
index 9dcae3e..a07469b 100644
--- a/src/network/ssl/qsslsocket.cpp
+++ b/src/network/ssl/qsslsocket.cpp
@@ -1966,6 +1966,11 @@ void QSslConfigurationPrivate::deepCopyDefaultConfiguration(QSslConfigurationPri
     QMutexLocker locker(&globalData()->mutex);
     const QSslConfigurationPrivate *global = globalData()->config.constData();
 
+    if (!global) {
+        ptr = 0;
+        return;
+    }
+
     ptr->ref = 1;
     ptr->peerCertificate = global->peerCertificate;
     ptr->peerCertificateChain = global->peerCertificateChain;
diff --git a/tests/auto/qsslsocket/tst_qsslsocket.cpp b/tests/auto/qsslsocket/tst_qsslsocket.cpp
index f931291..6ae4b10 100644
--- a/tests/auto/qsslsocket/tst_qsslsocket.cpp
+++ b/tests/auto/qsslsocket/tst_qsslsocket.cpp
@@ -181,6 +181,7 @@ private slots:
     void ignoreSslErrorsListWithSlot();
     void readFromClosedSocket();
     void writeBigChunk();
+    void setEmptyDefaultConfiguration();
 
     static void exitLoop()
     {
@@ -1794,6 +1795,21 @@ void tst_QSslSocket::writeBigChunk()
     socket->close();
 }
 
+void tst_QSslSocket::setEmptyDefaultConfiguration()
+{
+    // used to produce a crash in QSslConfigurationPrivate::deepCopyDefaultConfiguration, QTBUG-13265
+
+    if (!QSslSocket::supportsSsl())
+        return;
+
+    QSslConfiguration emptyConf;
+    QSslConfiguration::setDefaultConfiguration(emptyConf);
+
+    QSslSocketPtr socket = newSocket();
+    socket->connectToHostEncrypted(QtNetworkSettings::serverName(), 443);
+
+}
+
 #endif // QT_NO_OPENSSL
 
 QTEST_MAIN(tst_QSslSocket)