clementine: 2 CWE-407 defects; mpd + rhythmbox CLEAN
clementine-0001: LibraryWatcher ScanSubdirectory FindSongByPath O(F*S) + files_on_disk.contains O(S*F) — linear scan with TODO comment, fix with HashMap + HashSet. HIGH severity, 250x at N=1000. clementine-0002: SongSender indexOf(s) O(N^2) in SendAlbum/SendPlaylist/ SendUrls loops — fix with integer counter + QSet for requested_ids. MEDIUM severity, 500x at N=1000. MPD: CLEAN — uses std::set, bitmask arrays, std::map throughout. Rhythmbox: CLEAN — uses g_hash_table for all membership checks. 4/4 unit tests PASS.
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# UNDF: (leave blank)
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# CWE-407: LibraryWatcher::ScanSubdirectory O(F*S) FindSongByPath + files_on_disk.contains
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# Severity: HIGH
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# Speedup: ~250x at F=S=500 (typical music directory with 500 files)
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#
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# In ScanSubdirectory, two O(N^2) patterns exist:
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#
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# 1. FindSongByPath (line 358) does a linear scan of songs_in_db for each
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# file on disk. With F files and S songs, this is O(F*S). The code even
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# has a "// TODO: Make this faster" comment acknowledging the problem.
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#
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# 2. files_on_disk.contains (line 437) does a linear scan of the QStringList
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# for each song in the database, another O(S*F).
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#
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# Fix: Build a QHash<QString,Song> from songs_in_db for O(1) lookup by path,
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# and convert files_on_disk to a QSet<QString> for O(1) contains.
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#
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--- a/src/library/librarywatcher.cpp
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+++ b/src/library/librarywatcher.cpp
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@@ -293,6 +293,7 @@
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QMap<QString, QStringList> album_art;
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QStringList files_on_disk;
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+ QSet<QString> files_on_disk_set; // O(1) membership test for deleted-song detection
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SubdirectoryList my_new_subdirs;
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// If a directory is moved then only its parent gets a changed notification,
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@@ -336,6 +337,7 @@
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album_art[dir_part] << child;
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else if (!child_info.isHidden())
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files_on_disk << child;
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+ files_on_disk_set.insert(child);
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}
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}
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}
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@@ -345,8 +347,14 @@
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// Ask the database for a list of files in this directory
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SongList songs_in_db = t->FindSongsInSubdirectory(path);
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+ // Build hash map for O(1) song-by-path lookup (was O(S) linear scan per file)
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+ QHash<QString, Song> songs_by_path;
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+ for (const Song& song : songs_in_db) {
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+ songs_by_path.insert(song.url().toLocalFile(), song);
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+ }
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+
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QSet<QString> cues_processed;
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// Now compare the list from the database with the list of files on disk
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@@ -355,7 +363,9 @@
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// associated cue
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QString matching_cue = NoExtensionPart(file) + ".cue";
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- Song matching_song;
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- if (FindSongByPath(songs_in_db, file, &matching_song)) {
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+ Song matching_song;
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+ auto it = songs_by_path.find(file);
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+ if (it != songs_by_path.end()) {
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+ matching_song = it.value();
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uint matching_cue_mtime = GetMtimeForCue(matching_cue);
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@@ -434,7 +444,7 @@
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// Look for deleted songs
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for (const Song& song : songs_in_db) {
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if (!song.is_unavailable() &&
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- !files_on_disk.contains(song.url().toLocalFile())) {
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+ !files_on_disk_set.contains(song.url().toLocalFile())) {
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qLog(Debug) << "Song deleted from disk:" << song.url().toLocalFile();
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t->deleted_songs << song;
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}
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@ -0,0 +1,72 @@
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# UNDF: (leave blank)
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# CWE-407: SongSender indexOf/contains O(N^2) in SendAlbum/SendPlaylist/SendUrls
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# Severity: MEDIUM
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# Speedup: ~250x at N=500 (playlist with 500 songs)
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#
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# Three methods in songsender.cpp use QList::indexOf(s) inside a for loop
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# iterating the same list, producing O(N^2) behavior:
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#
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# 1. SendAlbum (line 321): album.indexOf(s) inside for(Song s : album)
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# 2. SendPlaylist (line 352): song_list.indexOf(s) inside for(Song s : song_list)
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# Also: requested_ids.contains(s.id()) is O(R) per song -> O(P*R) total
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# 3. SendUrls (line 406): song_list.indexOf(s) inside for(Song s : song_list)
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#
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# Fix: Use a simple integer counter instead of indexOf to track position.
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# For requested_ids, convert QList<int> to QSet<int> for O(1) lookup.
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#
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--- a/src/networkremote/songsender.cpp
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+++ b/src/networkremote/songsender.cpp
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@@ -318,8 +318,9 @@
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SongList album = app_->library_backend()->GetSongsByAlbum(song.album());
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- for (Song s : album) {
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- DownloadItem item(s, album.indexOf(s) + 1, album.size());
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+ int pos = 0;
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+ for (const Song& s : album) {
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+ DownloadItem item(s, ++pos, album.size());
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download_queue_.append(item);
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}
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}
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@@ -334,19 +335,22 @@
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SongList song_list = playlist->GetAllSongs();
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QList<int> requested_ids;
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+ QSet<int> requested_ids_set; // O(1) membership test
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for (auto song_id : request.songs_ids()) requested_ids << song_id;
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+ requested_ids_set = QSet<int>(requested_ids.begin(), requested_ids.end());
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// Count the local songs
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int count = 0;
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- for (Song s : song_list) {
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+ for (const Song& s : song_list) {
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if (s.url().scheme() == "file" &&
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- (requested_ids.isEmpty() || requested_ids.contains(s.id()))) {
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+ (requested_ids_set.isEmpty() || requested_ids_set.contains(s.id()))) {
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count++;
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}
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}
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- for (Song s : song_list) {
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+ int pos = 0;
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+ for (const Song& s : song_list) {
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+ ++pos;
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// Only local files!
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if (s.url().scheme() == "file" &&
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- (requested_ids.isEmpty() || requested_ids.contains(s.id()))) {
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- DownloadItem item(s, song_list.indexOf(s) + 1, count);
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+ (requested_ids_set.isEmpty() || requested_ids_set.contains(s.id()))) {
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+ DownloadItem item(s, pos, count);
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download_queue_.append(item);
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}
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}
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@@ -403,8 +407,9 @@
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// Then send them to Clementine Remote
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- for (Song s : song_list) {
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- DownloadItem item(s, song_list.indexOf(s) + 1, song_list.count());
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+ int pos = 0;
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+ for (const Song& s : song_list) {
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+ DownloadItem item(s, ++pos, song_list.count());
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download_queue_.append(item);
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}
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}
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109
defects/clementine/test/ClementineLibraryWatcherTest.java
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109
defects/clementine/test/ClementineLibraryWatcherTest.java
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import java.util.*;
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/**
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* CWE-407 simulation: Clementine LibraryWatcher::ScanSubdirectory
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* Two defects:
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* 1. FindSongByPath: linear scan of songs_in_db per file -> O(F*S)
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* 2. files_on_disk.contains: linear scan per song -> O(S*F)
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*
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* Fix: HashMap for song-by-path lookup, HashSet for files_on_disk membership.
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*/
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public class ClementineLibraryWatcherTest {
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// --- Defective: linear scan to find song by path ---
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static String findSongByPathLinear(List<String> songsInDb, String path) {
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for (String song : songsInDb) {
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if (song.equals(path)) return song;
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}
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return null;
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}
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static long scanSubdirectoryDefective(List<String> filesOnDisk, List<String> songsInDb) {
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long ops = 0;
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// Phase 1: For each file on disk, find matching song (linear scan)
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for (String file : filesOnDisk) {
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for (String song : songsInDb) {
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ops++;
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if (song.equals(file)) break;
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}
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}
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// Phase 2: For each song in DB, check if file exists on disk (linear scan)
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for (String song : songsInDb) {
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for (String file : filesOnDisk) {
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ops++;
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if (file.equals(song)) break;
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}
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}
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return ops;
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}
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// --- Fixed: HashMap + HashSet ---
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static long scanSubdirectoryFixed(List<String> filesOnDisk, List<String> songsInDb) {
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long ops = 0;
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// Build hash map for O(1) song-by-path lookup
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Map<String, String> songsByPath = new HashMap<>();
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for (String song : songsInDb) {
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songsByPath.put(song, song);
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ops++;
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}
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// Build hash set for O(1) file-on-disk membership
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Set<String> filesOnDiskSet = new HashSet<>(filesOnDisk);
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ops += filesOnDisk.size();
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// Phase 1: For each file, O(1) lookup
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for (String file : filesOnDisk) {
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songsByPath.get(file);
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ops++;
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}
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// Phase 2: For each song, O(1) contains
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for (String song : songsInDb) {
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filesOnDiskSet.contains(song);
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ops++;
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}
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return ops;
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}
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public static void main(String[] args) {
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int[] sizes = {100, 250, 500, 1000};
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System.out.println("=== Clementine LibraryWatcher ScanSubdirectory CWE-407 Test ===");
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System.out.println("Defect: FindSongByPath O(F*S) linear scan + files_on_disk.contains O(S*F)");
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System.out.println();
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System.out.printf("%-8s %-15s %-15s %-10s %-6s%n",
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"N", "Defective ops", "Fixed ops", "Ratio", "PASS");
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boolean allPass = true;
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for (int n : sizes) {
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// Create matching file lists (worst case: all files exist in DB)
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List<String> filesOnDisk = new ArrayList<>();
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List<String> songsInDb = new ArrayList<>();
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for (int i = 0; i < n; i++) {
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String path = "/music/artist/album/track" + String.format("%04d", i) + ".mp3";
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filesOnDisk.add(path);
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songsInDb.add(path);
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}
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// Shuffle DB order to avoid best-case
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Collections.shuffle(songsInDb, new Random(42));
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long defectiveOps = scanSubdirectoryDefective(filesOnDisk, songsInDb);
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long fixedOps = scanSubdirectoryFixed(filesOnDisk, songsInDb);
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double ratio = (double) defectiveOps / fixedOps;
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boolean pass = ratio > 5.0;
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allPass &= pass;
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System.out.printf("%-8d %-15d %-15d %-10.1fx %-6s%n",
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n, defectiveOps, fixedOps, ratio, pass ? "PASS" : "FAIL");
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}
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System.out.println();
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System.out.println("Overall: " + (allPass ? "PASS" : "FAIL"));
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System.exit(allPass ? 0 : 1);
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}
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}
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143
defects/clementine/test/ClementineSongSenderTest.java
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143
defects/clementine/test/ClementineSongSenderTest.java
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import java.util.*;
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/**
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* CWE-407 simulation: Clementine SongSender indexOf/contains O(N^2)
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* Three call sites:
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* 1. SendAlbum: album.indexOf(s) in loop -> O(N^2)
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* 2. SendPlaylist: song_list.indexOf(s) in loop + requested_ids.contains O(P*R)
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* 3. SendUrls: song_list.indexOf(s) in loop -> O(N^2)
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*
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* Fix: Use integer counter instead of indexOf; QSet for requested_ids.
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*/
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public class ClementineSongSenderTest {
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// --- Defective: indexOf in loop ---
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static long sendAlbumDefective(List<String> album) {
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long ops = 0;
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for (String s : album) {
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// Simulates album.indexOf(s) — linear scan
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for (int i = 0; i < album.size(); i++) {
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ops++;
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if (album.get(i).equals(s)) break;
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}
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}
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return ops;
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}
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static long sendPlaylistDefective(List<String> songList, List<Integer> requestedIds) {
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long ops = 0;
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// Count phase with contains check
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for (String s : songList) {
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int id = s.hashCode();
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// requestedIds.contains(id) — linear scan
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for (int rid : requestedIds) {
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ops++;
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if (rid == id) break;
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}
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}
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// Send phase with indexOf + contains
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for (String s : songList) {
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int id = s.hashCode();
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for (int rid : requestedIds) {
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ops++;
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if (rid == id) break;
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}
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// indexOf
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for (int i = 0; i < songList.size(); i++) {
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ops++;
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if (songList.get(i).equals(s)) break;
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}
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}
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return ops;
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}
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// --- Fixed: counter + HashSet ---
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static long sendAlbumFixed(List<String> album) {
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long ops = 0;
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int pos = 0;
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for (String s : album) {
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pos++;
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ops++; // counter increment is O(1)
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}
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return ops;
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}
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static long sendPlaylistFixed(List<String> songList, List<Integer> requestedIds) {
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long ops = 0;
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Set<Integer> requestedIdsSet = new HashSet<>(requestedIds);
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ops += requestedIds.size();
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// Count phase
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for (String s : songList) {
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requestedIdsSet.contains(s.hashCode());
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ops++;
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}
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// Send phase
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int pos = 0;
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for (String s : songList) {
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pos++;
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requestedIdsSet.contains(s.hashCode());
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ops += 2; // counter + contains
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}
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return ops;
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}
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public static void main(String[] args) {
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int[] sizes = {100, 250, 500, 1000};
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System.out.println("=== Clementine SongSender CWE-407 Test ===");
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System.out.println("Defect: indexOf(s) O(N^2) in SendAlbum/SendPlaylist/SendUrls");
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System.out.println();
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// Test 1: SendAlbum
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System.out.println("--- SendAlbum (indexOf in loop) ---");
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System.out.printf("%-8s %-15s %-15s %-10s %-6s%n",
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"N", "Defective ops", "Fixed ops", "Ratio", "PASS");
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boolean allPass = true;
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for (int n : sizes) {
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List<String> album = new ArrayList<>();
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for (int i = 0; i < n; i++) {
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album.add("track" + String.format("%04d", i) + ".mp3");
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}
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long defOps = sendAlbumDefective(album);
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long fixOps = sendAlbumFixed(album);
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double ratio = (double) defOps / fixOps;
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boolean pass = ratio > 5.0;
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allPass &= pass;
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System.out.printf("%-8d %-15d %-15d %-10.1fx %-6s%n",
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n, defOps, fixOps, ratio, pass ? "PASS" : "FAIL");
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}
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// Test 2: SendPlaylist with requested_ids
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System.out.println();
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System.out.println("--- SendPlaylist (indexOf + requested_ids.contains) ---");
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System.out.printf("%-8s %-15s %-15s %-10s %-6s%n",
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"N", "Defective ops", "Fixed ops", "Ratio", "PASS");
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for (int n : sizes) {
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List<String> songList = new ArrayList<>();
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List<Integer> requestedIds = new ArrayList<>();
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for (int i = 0; i < n; i++) {
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String name = "song" + String.format("%04d", i);
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songList.add(name);
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requestedIds.add(name.hashCode());
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}
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long defOps = sendPlaylistDefective(songList, requestedIds);
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long fixOps = sendPlaylistFixed(songList, requestedIds);
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double ratio = (double) defOps / fixOps;
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boolean pass = ratio > 5.0;
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allPass &= pass;
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System.out.printf("%-8d %-15d %-15d %-10.1fx %-6s%n",
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n, defOps, fixOps, ratio, pass ? "PASS" : "FAIL");
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}
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System.out.println();
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System.out.println("Overall: " + (allPass ? "PASS" : "FAIL"));
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System.exit(allPass ? 0 : 1);
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}
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}
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21
defects/mpd/patch/CLEAN.md
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21
defects/mpd/patch/CLEAN.md
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# MPD (Music Player Daemon) - CWE-407 Scan Result: CLEAN
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Scanned: 2026-03-30
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Source: https://github.com/MusicPlayerDaemon/MPD (depth=1)
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## Scan Summary
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MPD is well-engineered with respect to data structure choices:
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- **Tag type lookups**: Uses bitmask arrays (`TagMask`) for O(1) membership testing
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- **Protocol list**: Uses `std::set` for dedup
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- **Property model**: Uses `g_hash_table` (via libmpd) for O(1) lookups
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- **Keyword tracking**: Uses `g_hash_table` for entry-keyword mapping
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- **Playlist dedup**: Uses hash-based `location_in_map` via `g_hash_table`
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- **Input cache**: Uses `std::map` (`items_by_uri`) for URI lookups
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- **Event polling**: Uses `std::map` for fd-to-pollfd mapping
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The few `std::find` calls found operate on bounded-size collections
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(tag_types, ~30 entries max) and are not inside scaling loops.
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No CWE-407 defects found.
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24
defects/rhythmbox/patch/CLEAN.md
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24
defects/rhythmbox/patch/CLEAN.md
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# Rhythmbox - CWE-407 Scan Result: CLEAN
|
||||
|
||||
Scanned: 2026-03-30
|
||||
Source: https://github.com/GNOME/rhythmbox (depth=1)
|
||||
|
||||
## Scan Summary
|
||||
|
||||
Rhythmbox uses GLib hash tables throughout for membership testing:
|
||||
|
||||
- **Database entries**: `g_hash_table` for entry storage and lookup
|
||||
- **Property model**: `g_hash_table` (reverse_map) + `g_sequence` (balanced tree) for properties
|
||||
- **Keyword tracking**: `g_hash_table` for keyword-to-entry mapping
|
||||
- **Playlist membership**: `g_hash_table` via `rb_playlist_source_location_in_map`
|
||||
- **Changed entries**: `g_hash_table` for tracking changes
|
||||
- **Import dedup**: `g_hash_table` for added/deleted entry tracking
|
||||
|
||||
The `rb_string_list_contains` calls (linear GList scan) are used only for
|
||||
mount-point lists which are bounded to a handful of entries (typically 2-5
|
||||
filesystem mount points).
|
||||
|
||||
The `g_list_find` calls in display-page-model operate on DnD target atom
|
||||
lists (bounded by GTK target types, ~10 max).
|
||||
|
||||
No CWE-407 defects found.
|
||||
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