Fix random crashes when bearer suddenly goes down

1. QNetworkSession being deleted from the closed signal caused data
   abort or E32User-CBase 49 panics. (both observed)
2. Potential E32User-CBase 46 panic in
   ConnectionProgressNotifier::StartNotifications()

Reviewed-by: Aaron Tunney
Reviewed-By: Markus Goetz

Task-Number: QTBUG-17196

1 files changed, 4 insertions, 3 deletions

diff --git a/src/network/access/qnetworkaccessmanager.cpp b/src/network/access/qnetworkaccessmanager.cpp
index 7d37375..9c5a035 100644
--- a/src/network/access/qnetworkaccessmanager.cpp
+++ b/src/network/access/qnetworkaccessmanager.cpp
@@ -1358,10 +1358,11 @@ void QNetworkAccessManagerPrivate::createSession(const QNetworkConfiguration &co
 
     networkSession = QSharedNetworkSessionManager::getSession(config);
 
-    QObject::connect(networkSession.data(), SIGNAL(opened()), q, SIGNAL(networkSessionConnected()));
-    QObject::connect(networkSession.data(), SIGNAL(closed()), q, SLOT(_q_networkSessionClosed()));
+    QObject::connect(networkSession.data(), SIGNAL(opened()), q, SIGNAL(networkSessionConnected()), Qt::QueuedConnection);
+    //QueuedConnection is used to avoid deleting the networkSession inside its closed signal
+    QObject::connect(networkSession.data(), SIGNAL(closed()), q, SLOT(_q_networkSessionClosed()), Qt::QueuedConnection);
     QObject::connect(networkSession.data(), SIGNAL(stateChanged(QNetworkSession::State)),
-                     q, SLOT(_q_networkSessionStateChanged(QNetworkSession::State)));
+                     q, SLOT(_q_networkSessionStateChanged(QNetworkSession::State)), Qt::QueuedConnection);
 
     _q_networkSessionStateChanged(networkSession->state());
 }