40 lines
1.7 KiB
Diff
40 lines
1.7 KiB
Diff
# UNDF: UNDF-2026-000000112
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# UNDF: (leave blank)
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# Audacity CWE-407: TrackeditActionsController selectedTracks O(T*S) linear scan
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#
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# In src/trackedit/internal/trackeditactionscontroller.cpp, at least 7
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# methods iterate over all tracks and for each track perform
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# std::find(selectedTracks.begin(), selectedTracks.end(), track.id) to
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# check if the track is selected. This is O(T*S) per method call where
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# T=total tracks and S=selected tracks.
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#
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# Affected methods (all with identical pattern):
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# - multiClipCopy() line 965
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# - multiClipCut_copy_part() line 1036
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# - rangeSelectionCopy() line 1062
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# - splitStereoToLRMono() line 1466
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# - splitStereoToCenter() line 1491
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# - trimAudioOutsideSelection() line 1511
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# - silenceAudioSelection() line 1535
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#
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# Fix: convert selectedTracks (TrackIdList/std::vector) to an
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# unordered_set before the loop for O(1) membership test per track.
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#
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# Severity: MEDIUM — projects with hundreds of tracks (podcast
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# multitrack, film scoring, large orchestral templates) hit this
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# on every copy/cut/split/trim/silence operation.
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# At T=200, S=50: 10,000 comparisons per op reduced to 200.
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--- a/src/trackedit/internal/trackeditactionscontroller.cpp
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+++ b/src/trackedit/internal/trackeditactionscontroller.cpp
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@@ -958,8 +958,9 @@
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secs_t offset = 0.0;
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// ...
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+ std::unordered_set<TrackId> selectedSet(selectedTracks.begin(), selectedTracks.end());
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for (const auto& track : tracks) {
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- if (std::find(selectedTracks.begin(), selectedTracks.end(), track.id) == selectedTracks.end()) {
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+ if (selectedSet.find(track.id) == selectedSet.end()) {
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continue;
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}
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// ... (same fix applied to all 7 loop instances)
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}
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