Fix possible crash when adding a tracker to a magnet torrent without metadata (Closes #1034254)

src/properties/propertieswidget.cpp

@@ -396,7 +396,9 @@ void PropertiesWidget::loadDynamicData() {
         filesList->setUpdatesEnabled(true);
       }
     }
-  } catch(invalid_handle e) {}
+  } catch(const invalid_handle& e) {
+    qWarning() << "Caught exception in PropertiesWidget::loadDynamicData(): " << e.what();
+  }
 }
 
 void PropertiesWidget::loadUrlSeeds() {

src/properties/trackerlist.cpp

@@ -186,6 +186,28 @@ void TrackerList::clear() {
 }
 
 void TrackerList::loadStickyItems(const QTorrentHandle &h) {
+  // load DHT information
+  if (QBtSession::instance()->isDHTEnabled() && (!h.has_metadata() || !h.priv())) {
+    dht_item->setText(COL_STATUS, tr("Working"));
+  } else {
+    dht_item->setText(COL_STATUS, tr("Disabled"));
+  }
+  if (h.has_metadata() && h.priv()) {
+    dht_item->setText(COL_MSG, tr("This torrent is private"));
+  }
+
+  // Load PeX Information
+  if (QBtSession::instance()->isPexEnabled())
+    pex_item->setText(COL_STATUS, tr("Working"));
+  else
+    pex_item->setText(COL_STATUS, tr("Disabled"));
+
+  // Load LSD Information
+  if (QBtSession::instance()->isLSDEnabled())
+    lsd_item->setText(COL_STATUS, tr("Working"));
+  else
+    lsd_item->setText(COL_STATUS, tr("Disabled"));
+
   // XXX: libtorrent should provide this info...
   // Count peers from DHT, LSD, PeX
   uint nb_dht = 0, nb_lsd = 0, nb_pex = 0;
@@ -201,27 +223,8 @@ void TrackerList::loadStickyItems(const QTorrentHandle &h) {
     if (it->source & peer_info::pex)
       ++nb_pex;
   }
-  // load DHT information
-  if (QBtSession::instance()->isDHTEnabled() && !h.priv()) {
-    dht_item->setText(COL_STATUS, tr("Working"));
-  } else {
-    dht_item->setText(COL_STATUS, tr("Disabled"));
-  }
   dht_item->setText(COL_PEERS, QString::number(nb_dht));
-  if (h.has_metadata() && h.priv()) {
-    dht_item->setText(COL_MSG, tr("This torrent is private"));
-  }
-  // Load PeX Information
-  if (QBtSession::instance()->isPexEnabled())
-    pex_item->setText(COL_STATUS, tr("Working"));
-  else
-    pex_item->setText(COL_STATUS, tr("Disabled"));
   pex_item->setText(COL_PEERS, QString::number(nb_pex));
-  // Load LSD Information
-  if (QBtSession::instance()->isLSDEnabled())
-    lsd_item->setText(COL_STATUS, tr("Working"));
-  else
-    lsd_item->setText(COL_STATUS, tr("Disabled"));
   lsd_item->setText(COL_PEERS, QString::number(nb_lsd));
 }
 

src/sessionapplication.cpp

@@ -28,6 +28,7 @@
  * Contact : chris@qbittorrent.org
  */
 
+#include <QDebug>
 #include "sessionapplication.h"
 
 SessionApplication::SessionApplication(const QString &id, int &argc, char **argv) :
@@ -42,3 +43,13 @@ void SessionApplication::commitData(QSessionManager & manager) {
   Q_UNUSED(manager);
   emit sessionIsShuttingDown();
 }
+
+bool SessionApplication::notify(QObject* receiver, QEvent* event) {
+  try {
+    return QApplication::notify(receiver, event);
+  } catch(const std::exception& e) {
+    qCritical() << "Exception thrown:" << e.what() << ", receiver: " << receiver->objectName();
+    receiver->dumpObjectInfo();
+  }
+  return false;
+}

src/sessionapplication.h

@@ -54,6 +54,9 @@ public:
   SessionApplication(const QString &id, int &argc, char **argv);
   void commitData(QSessionManager & manager);
 
+protected:
+    virtual bool notify(QObject* receiver, QEvent* event);
+
   signals:
     void sessionIsShuttingDown();
 };