Fix crashes in devices

src/device/connecteddevice.cpp

@@ -68,7 +68,9 @@ ConnectedDevice::ConnectedDevice(const QUrl &url, DeviceLister *lister, const QS
 
 }
 
-ConnectedDevice::~ConnectedDevice() { backend_->deleteLater(); }
+ConnectedDevice::~ConnectedDevice() {
+  backend_->deleteLater();
+}
 
 void ConnectedDevice::InitBackendDirectory(const QString &mount_point, bool first_time, bool rewrite_path) {
 

src/device/devicelister.cpp

@@ -35,6 +35,8 @@
 
 #include "devicelister.h"
 
+#include "core/logging.h"
+
 DeviceLister::DeviceLister() : thread_(nullptr) {}
 
 DeviceLister::~DeviceLister() {

src/device/devicelister.h

@@ -75,7 +75,7 @@ class DeviceLister : public QObject {
   virtual void UpdateDeviceFreeSpace(const QString &id) = 0;
   virtual void ShutDown() {}
 
-signals:
+ signals:
   void DeviceAdded(const QString &id);
   void DeviceRemoved(const QString &id);
   void DeviceChanged(const QString &id);

src/device/devicemanager.cpp

@@ -108,7 +108,7 @@ DeviceManager::DeviceManager(Application *app, QObject *parent)
   backend_->moveToThread(app_->database()->thread());
   backend_->Init(app_->database());
 
-  // This reads from the database and contends on the database mutex, which can be very slow on startup.
+  // This reads from the database and contents on the database mutex, which can be very slow on startup.
   ConcurrentRun::Run<void>(&thread_pool_, bind(&DeviceManager::LoadAllDevices, this));
 
   // This proxy model only shows connected devices
@@ -179,13 +179,14 @@ QVariant DeviceManager::data(const QModelIndex &index, int role) const {
   if (!index.isValid() || index.column() != 0) return QVariant();
 
   const DeviceInfo *info = IndexToItem(index);
+  if (!info) return QVariant();
 
   switch (role) {
     case Qt::DisplayRole: {
       QString text;
       if (!info->friendly_name_.isEmpty())
         text = info->friendly_name_;
-      else
+      else if (info->BestBackend())
         text = info->BestBackend()->unique_id_;
 
       if (info->size_)
@@ -210,6 +211,7 @@ QVariant DeviceManager::data(const QModelIndex &index, int role) const {
       return info->friendly_name_;
 
     case Role_UniqueId:
+      if (!info->BestBackend()) return QString();
       return info->BestBackend()->unique_id_;
 
     case Role_IconName:
@@ -221,11 +223,11 @@ QVariant DeviceManager::data(const QModelIndex &index, int role) const {
 
     case Role_FreeSpace:
     case MusicStorage::Role_FreeSpace:
-      return info->BestBackend()->lister_ ? info->BestBackend()->lister_->DeviceFreeSpace(info->BestBackend()->unique_id_) : QVariant();
+      return ((info->BestBackend() && info->BestBackend()->lister_) ? info->BestBackend()->lister_->DeviceFreeSpace(info->BestBackend()->unique_id_) : QVariant());
 
     case Role_State:
       if (info->device_) return State_Connected;
-      if (info->BestBackend()->lister_) {
+      if (info->BestBackend() && info->BestBackend()->lister_) {
         if (info->BestBackend()->lister_->DeviceNeedsMount(info->BestBackend()->unique_id_)) return State_NotMounted;
         return State_NotConnected;
       }
@@ -243,9 +245,9 @@ QVariant DeviceManager::data(const QModelIndex &index, int role) const {
 
     case MusicStorage::Role_StorageForceConnect:
       if (!info->device_) {
-        if (info->database_id_ == -1 && !info->BestBackend()->lister_->DeviceNeedsMount(info->BestBackend()->unique_id_)) {
+        if (info->database_id_ == -1 && info->BestBackend() && !info->BestBackend()->lister_->DeviceNeedsMount(info->BestBackend()->unique_id_)) {
 
-          if (info->BestBackend()->lister_->AskForScan(info->BestBackend()->unique_id_)) {
+          if (info->BestBackend() && info->BestBackend()->lister_->AskForScan(info->BestBackend()->unique_id_)) {
             std::unique_ptr<QMessageBox> dialog(new QMessageBox(QMessageBox::Information, tr("Connect device"), tr("This is the first time you have connected this device.  Strawberry will now scan the device to find music files - this may take some time."), QMessageBox::Cancel));
             QPushButton *connect = dialog->addButton(tr("Connect device"), QMessageBox::AcceptRole);
             dialog->exec();
@@ -282,6 +284,7 @@ QVariant DeviceManager::data(const QModelIndex &index, int role) const {
     default:
       return QVariant();
   }
+
 }
 
 void DeviceManager::AddLister(DeviceLister *lister) {
@@ -329,8 +332,9 @@ int DeviceManager::FindDeviceByUrl(const QList<QUrl> &urls) const {
 void DeviceManager::PhysicalDeviceAdded(const QString &id) {
 
   DeviceLister *lister = qobject_cast<DeviceLister*>(sender());
+  if (!lister) return;
 
-  qLog(Info) << "Device added:" << id;
+  qLog(Info) << "Device added:" << id << lister->DeviceUniqueIDs();
 
   // Do we have this device already?
   int i = FindDeviceById(id);
@@ -562,12 +566,15 @@ DeviceLister *DeviceManager::GetLister(int row) const {
 void DeviceManager::Disconnect(int row) {
 
   DeviceInfo *info = devices_[row];
-  if (!info->device_)  // Already disconnected
+  if (!info || !info->device_)
     return;
 
   info->device_.reset();
   emit DeviceDisconnected(row);
+
   QModelIndex index = ItemToIndex(info);
+  if (!index.isValid()) return;
+
   emit dataChanged(index, index);
 
 }
@@ -700,6 +707,8 @@ void DeviceManager::DeviceSongCountUpdated(int count) {
   if (row == -1) return;
 
   QModelIndex index = ItemToIndex(devices_[row]);
+  if (!index.isValid()) return;
+
   emit dataChanged(index, index);
 
 }
@@ -716,8 +725,14 @@ DeviceInfo *DeviceManager::ItemFromRow(int row) {
 QString DeviceManager::DeviceNameByID(QString unique_id) {
 
   int row = FindDeviceById(unique_id);
+  if (row == -1) return QString();
+
   DeviceInfo *info = devices_[row];
+  if (!info) return QString();
+
   QModelIndex index = ItemToIndex(info);
+  if (!index.isValid()) return QString();
+
   return data(index, DeviceManager::Role_FriendlyName).toString();
 
 }

src/device/deviceview.cpp

@@ -324,6 +324,7 @@ void DeviceView::DeviceConnected(int row) {
 
 void DeviceView::DeviceDisconnected(int row) {
   DeviceInfo *info = app_->device_manager()->ItemFromRow(row);
+  if (!info) return;
   QModelIndex index = app_->device_manager()->ItemToIndex(info);
   merged_model_->RemoveSubModel(sort_model_->mapFromSource(index));
 }

src/device/filesystemdevice.cpp

@@ -26,6 +26,8 @@
 #include <QUrl>
 
 #include "core/application.h"
+#include "core/logging.h"
+
 #include "collection/collectionbackend.h"
 #include "collection/collectionmodel.h"
 #include "collection/collectionwatcher.h"
@@ -42,6 +44,7 @@ FilesystemDevice::FilesystemDevice(const QUrl &url, DeviceLister *lister, const
   watcher_->moveToThread(watcher_thread_);
   watcher_thread_->start(QThread::IdlePriority);
 
+  qLog(Debug) << __PRETTY_FUNCTION__ << unique_id;
   watcher_->set_device_name(manager->DeviceNameByID(unique_id));
   watcher_->set_backend(backend_);
   watcher_->set_task_manager(app_->task_manager());

src/device/giolister.cpp

@@ -62,11 +62,7 @@ bool GioLister::DeviceInfo::is_suitable() const {
 
   if (filesystem_type.isEmpty()) return true;
 
-  return filesystem_type != "udf" &&
-         filesystem_type != "smb" &&
-         filesystem_type != "cifs" &&
-         filesystem_type != "ssh" &&
-         filesystem_type != "isofs";
+  return filesystem_type != "udf" && filesystem_type != "smb" && filesystem_type != "cifs" && filesystem_type != "ssh" && filesystem_type != "isofs";
 
 }
 
@@ -336,9 +332,8 @@ void GioLister::MountAdded(GMount *mount) {
 
   if (!old_id.isEmpty())
     emit DeviceChanged(old_id);
-  else {
+  else
     emit DeviceAdded(info.unique_id());
-  }
 
 }
 
@@ -527,6 +522,7 @@ void GioLister::UnmountDevice(const QString &id) {
       return;
     }
   }
+  else return;
 
   if (g_mount_can_eject(info.mount)) {
     g_mount_eject_with_operation(info.mount, G_MOUNT_UNMOUNT_NONE, nullptr, nullptr, (GAsyncReadyCallback)MountEjectFinished, nullptr);

src/device/gpoddevice.cpp

@@ -77,6 +77,13 @@ void GPodDevice::LoadFinished(Itdb_iTunesDB *db) {
   db_ = db;
   db_wait_cond_.wakeAll();
 
+  if (loader_thread_) {
+    loader_thread_->quit();
+    loader_thread_->wait(1000);
+    loader_thread_->deleteLater();
+    loader_thread_ = nullptr;
+  }
+
   loader_->deleteLater();
   loader_ = nullptr;
 

src/device/udisks2lister.cpp

@@ -120,8 +120,7 @@ QString Udisks2Lister::MakeFriendlyName(const QString &id) {
 QList<QUrl> Udisks2Lister::MakeDeviceUrls(const QString &id) {
   QReadLocker locker(&device_data_lock_);
   if (!device_data_.contains(id)) return QList<QUrl>();
-  return QList<QUrl>() << QUrl::fromLocalFile(
-             device_data_[id].mount_paths.at(0));
+  return QList<QUrl>() << QUrl::fromLocalFile(device_data_[id].mount_paths.at(0));
 }
 
 void Udisks2Lister::UnmountDevice(const QString &id) {