Check that QIODevice::open() is successful, and explicitly call close()

src/collection/collectionwatcher.cpp

@@ -790,6 +790,7 @@ SongList CollectionWatcher::ScanNewFile(const QString &file, const QString &path
     // Playlist parser for CUEs considers every entry in sheet valid and we don't want invalid media getting into collection!
     QString file_nfd = file.normalized(QString::NormalizationForm_D);
     SongList cue_congs = cue_parser_->Load(&cue_file, matching_cue, path, false);
+    cue_file.close();
     songs.reserve(cue_congs.count());
     for (Song &cue_song : cue_congs) {
       cue_song.set_source(source_);

src/core/commandlineoptions.cpp

@@ -340,11 +340,11 @@ bool CommandlineOptions::contains_play_options() const {
 QByteArray CommandlineOptions::Serialize() const {
 
   QBuffer buf;
-  buf.open(QIODevice::WriteOnly);
-
+  if (buf.open(QIODevice::WriteOnly)) {
     QDataStream s(&buf);
     s << *this;
     buf.close();
+  }
 
   return buf.data().toBase64();
 
@@ -354,10 +354,10 @@ void CommandlineOptions::Load(const QByteArray &serialized) {
 
   QByteArray copy = QByteArray::fromBase64(serialized);
   QBuffer buf(&copy);
-  buf.open(QIODevice::ReadOnly);
-
+  if (buf.open(QIODevice::ReadOnly)) {
     QDataStream s(&buf);
     s >> *this;
+  }
 
 }
 

src/core/database.cpp

@@ -387,9 +387,12 @@ void Database::ExecSchemaCommandsFromFile(QSqlDatabase &db, const QString &filen
 
   // Open and read the database schema
   QFile schema_file(filename);
-  if (!schema_file.open(QIODevice::ReadOnly))
+  if (!schema_file.open(QIODevice::ReadOnly)) {
     qFatal("Couldn't open schema file %s", filename.toUtf8().constData());
+    return;
+  }
   ExecSchemaCommands(db, QString::fromUtf8(schema_file.readAll()), schema_version, in_transaction);
+  schema_file.close();
 
 }
 

src/core/songloader.cpp

@@ -358,12 +358,15 @@ void SongLoader::EffectiveSongLoad(Song *song) {
 }
 
 void SongLoader::LoadPlaylist(ParserBase *parser, const QString &filename) {
+
   QFile file(filename);
-  file.open(QIODevice::ReadOnly);
+  if (file.open(QIODevice::ReadOnly)) {
     songs_ = parser->Load(&file, filename, QFileInfo(filename).path());
     file.close();
   }
 
+}
+
 static bool CompareSongs(const Song &left, const Song &right) {
 
   // Order by artist, album, disc, track
@@ -429,9 +432,10 @@ void SongLoader::StopTypefind() {
 
     // Parse the playlist
     QBuffer buf(&buffer_);
-    buf.open(QIODevice::ReadOnly);
+    if (buf.open(QIODevice::ReadOnly)) {
       songs_ = parser_->Load(&buf);
       buf.close();
+    }
 
   }
   else if (success_) {

src/internet/localredirectserver.cpp

@@ -341,8 +341,9 @@ void LocalRedirectServer::ReadyRead() {
 void LocalRedirectServer::WriteTemplate() const {
 
   QFile page_file(":/html/oauthsuccess.html");
-  page_file.open(QIODevice::ReadOnly);
+  if (!page_file.open(QIODevice::ReadOnly)) return;
   QString page_data = QString::fromUtf8(page_file.readAll());
+  page_file.close();
 
   QRegularExpression tr_regexp("tr\\(\"([^\"]+)\"\\)");
   int offset = 0;
@@ -359,13 +360,15 @@ void LocalRedirectServer::WriteTemplate() const {
   }
 
   QBuffer image_buffer;
-  image_buffer.open(QIODevice::ReadWrite);
+  if (image_buffer.open(QIODevice::ReadWrite)) {
     QApplication::style()
         ->standardIcon(QStyle::SP_DialogOkButton)
         .pixmap(16)
         .toImage()
         .save(&image_buffer, "PNG");
     page_data.replace("@IMAGE_DATA@", image_buffer.data().toBase64());
+    image_buffer.close();
+  }
 
   socket_->write("HTTP/1.0 200 OK\r\n");
   socket_->write("Content-type: text/html;charset=UTF-8\r\n");

src/main.cpp

@@ -222,7 +222,9 @@ int main(int argc, char *argv[]) {
     // Create the file if it doesn't exist already
     if (!QFile::exists(s.fileName())) {
       QFile file(s.fileName());
-      file.open(QIODevice::WriteOnly);
+      if (file.open(QIODevice::WriteOnly)) {
+        file.close();
+      }
     }
 
     // Set -rw-------

src/moodbar/moodbarloader.cpp

@@ -113,6 +113,7 @@ MoodbarLoader::Result MoodbarLoader::Load(const QUrl &url, QByteArray *data, Moo
     if (f.open(QIODevice::ReadOnly)) {
       qLog(Info) << "Loading moodbar data from" << possible_mood_file;
       *data = f.readAll();
+      f.close();
       return Loaded;
     }
   }
@@ -184,6 +185,7 @@ void MoodbarLoader::RequestFinished(MoodbarPipeline *request, const QUrl &url) {
       QFile mood_file(mood_filename);
       if (mood_file.open(QIODevice::WriteOnly)) {
         mood_file.write(request->data());
+        mood_file.close();
 
 #ifdef Q_OS_WIN32
         if (!SetFileAttributes((LPCTSTR)mood_filename.utf16(), FILE_ATTRIBUTE_HIDDEN)) {

src/playlist/playlist.cpp

@@ -1240,7 +1240,7 @@ QMimeData *Playlist::mimeData(const QModelIndexList &indexes) const {
   }
 
   QBuffer buf;
-  buf.open(QIODevice::WriteOnly);
+  if (!buf.open(QIODevice::WriteOnly)) return nullptr;
   QDataStream stream(&buf);
 
   const Playlist *self = this;

src/playlist/playlistbackend.cpp

@@ -294,6 +294,7 @@ PlaylistItemPtr PlaylistBackend::RestoreCueData(PlaylistItemPtr item, std::share
       if (!cue_file.open(QIODevice::ReadOnly)) return item;
 
       song_list = cue_parser.Load(&cue_file, cue_path, QDir(cue_path.section('/', 0, -2)));
+      cue_file.close();
       state->cached_cues_[cue_path] = song_list;
     }
     else {

src/playlistparsers/asxparser.cpp

@@ -63,15 +63,15 @@ SongList ASXParser::Load(QIODevice *device, const QString &playlist_path, const
   }
 
   QBuffer buffer(&data);
-  buffer.open(QIODevice::ReadOnly);
-
-  SongList ret;
+  if (!buffer.open(QIODevice::ReadOnly)) return SongList();
 
   QXmlStreamReader reader(&buffer);
   if (!Utilities::ParseUntilElementCI(&reader, "asx")) {
-    return ret;
+    buffer.close();
+    return SongList();
   }
 
+  SongList ret;
   while (!reader.atEnd() && Utilities::ParseUntilElementCI(&reader, "entry")) {
     Song song = ParseTrack(&reader, dir, collection_search);
     if (song.is_valid()) {
@@ -79,6 +79,8 @@ SongList ASXParser::Load(QIODevice *device, const QString &playlist_path, const
     }
   }
 
+  buffer.close();
+
   return ret;
 
 }

src/playlistparsers/m3uparser.cpp

@@ -46,8 +46,6 @@ SongList M3UParser::Load(QIODevice *device, const QString &playlist_path, const
 
   Q_UNUSED(playlist_path);
 
-  SongList ret;
-
   M3UType type = STANDARD;
   Metadata current_metadata;
 
@@ -56,7 +54,7 @@ SongList M3UParser::Load(QIODevice *device, const QString &playlist_path, const
   data.replace("\n\n", "\n");
   QByteArray bytes = data.toUtf8();
   QBuffer buffer(&bytes);
-  buffer.open(QIODevice::ReadOnly);
+  if (!buffer.open(QIODevice::ReadOnly)) return SongList();
 
   QString line = QString::fromUtf8(buffer.readLine()).trimmed();
   if (line.startsWith("#EXTM3U")) {
@@ -65,6 +63,7 @@ SongList M3UParser::Load(QIODevice *device, const QString &playlist_path, const
     line = QString::fromUtf8(buffer.readLine()).trimmed();
   }
 
+  SongList ret;
   forever {
     if (line.startsWith('#')) {
       // Extended info or comment.
@@ -95,6 +94,8 @@ SongList M3UParser::Load(QIODevice *device, const QString &playlist_path, const
     line = QString::fromUtf8(buffer.readLine()).trimmed();
   }
 
+  buffer.close();
+
   return ret;
 
 }

src/playlistparsers/playlistparser.cpp

@@ -166,9 +166,12 @@ SongList PlaylistParser::LoadFromFile(const QString &filename) const {
 
   // Open the file
   QFile file(filename);
-  file.open(QIODevice::ReadOnly);
+  if (!file.open(QIODevice::ReadOnly)) return SongList();
 
-  return parser->Load(&file, filename, info.absolutePath());
+  SongList ret = parser->Load(&file, filename, info.absolutePath());
+  file.close();
+
+  return ret;
 
 }
 

src/queue/queue.cpp

@@ -342,12 +342,12 @@ QMimeData *Queue::mimeData(const QModelIndexList &indexes) const {
   }
 
   QBuffer buf;
-  buf.open(QIODevice::WriteOnly);
+  if (buf.open(QIODevice::WriteOnly)) {
     QDataStream stream(&buf);
     stream << rows;
     buf.close();
-
     data->setData(kRowsMimetype, buf.data());
+  }
 
   return data;
 

src/settings/contextsettingspage.cpp

@@ -120,6 +120,7 @@ ContextSettingsPage::ContextSettingsPage(SettingsDialog *dialog, QWidget *parent
     QString text = file.readAll();
     ui_->preview_headline->setText(text);
     ui_->preview_normal->setText(text);
+    file.close();
   }
 
 }

src/smartplaylists/smartplaylistsearchtermwidget.cpp

@@ -124,14 +124,16 @@ SmartPlaylistSearchTermWidget::SmartPlaylistSearchTermWidget(CollectionBackend *
 
   // Set stylesheet
   QFile stylesheet_file(":/style/smartplaylistsearchterm.css");
-  stylesheet_file.open(QIODevice::ReadOnly);
+  if (stylesheet_file.open(QIODevice::ReadOnly)) {
     QString stylesheet = QString::fromLatin1(stylesheet_file.readAll());
+    stylesheet_file.close();
     const QColor base(222, 97, 97, 128);
     stylesheet.replace("%light2", Utilities::ColorToRgba(base.lighter(140)));
     stylesheet.replace("%light", Utilities::ColorToRgba(base.lighter(120)));
     stylesheet.replace("%dark", Utilities::ColorToRgba(base.darker(120)));
     stylesheet.replace("%base", Utilities::ColorToRgba(base));
     setStyleSheet(stylesheet);
+  }
 
 }