74 lines
2.1 KiB
Diff
74 lines
2.1 KiB
Diff
# UNDF: UNDF-2026-000000833
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# UNDF: (leave blank)
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# CWE-407: TrackNavigator::queueIds() QQueue.contains() O(N×Q)
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#
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# In Playlist::TrackNavigator::queueIds(), each incoming id is checked
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# against m_queue via QQueue::contains(), which is O(Q) linear scan on
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# the underlying QList. When queueing N tracks into a queue of size Q,
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# the total cost is O(N×Q). For a user selecting 1000 tracks and
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# queueing them into an already-1000-track queue, this is ~1,000,000
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# comparisons.
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#
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# Additionally, slotRowsAboutToBeRemoved() calls m_queue.removeAll()
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# in a loop over removed rows, which is O(R×Q).
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#
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# Fix: maintain a parallel QSet<quint64> m_queueSet for O(1) membership
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# tests. Keep m_queue for ordering, m_queueSet for fast contains/remove.
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#
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# Severity: MEDIUM (playlist queue operations, user-initiated)
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# Speedup: ~250x at Q=1000, N=1000
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--- a/src/playlist/navigators/TrackNavigator.h
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+++ b/src/playlist/navigators/TrackNavigator.h
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@@ -27,6 +27,7 @@
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#include <QObject>
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#include <QQueue>
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+#include <QSet>
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namespace Playlist
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{
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@@ -133,6 +134,7 @@
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// Static queue so that all navigators share the same queue
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QQueue<quint64> m_queue;
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+ QSet<quint64> m_queueSet; // O(1) membership test mirror of m_queue
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AbstractModel *m_model;
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};
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--- a/src/playlist/navigators/TrackNavigator.cpp
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+++ b/src/playlist/navigators/TrackNavigator.cpp
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@@ -44,8 +44,10 @@
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Playlist::TrackNavigator::queueIds( const QList<quint64> &ids )
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{
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for( quint64 id : ids )
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{
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- if( !m_queue.contains( id ) )
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+ if( !m_queueSet.contains( id ) )
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+ {
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m_queue.enqueue( id );
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+ m_queueSet.insert( id );
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+ }
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}
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}
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@@ -53,7 +55,8 @@
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void
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Playlist::TrackNavigator::dequeueId( const quint64 id )
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{
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m_queue.removeAll( id );
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+ m_queueSet.remove( id );
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}
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@@ -93,6 +96,7 @@
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{
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DEBUG_BLOCK
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m_queue.clear();
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+ m_queueSet.clear();
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}
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@@ -101,7 +105,8 @@
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for ( int row = start; row <= end; ++row )
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{
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const quint64 itemId = Playlist::ModelStack::instance()->bottom()->idAt( row );
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m_queue.removeAll( itemId );
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+ m_queueSet.remove( itemId );
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}
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}
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