kdenlive+audacity: 5-MOAD rescan; kdenlive-0010 CWE-407 checkConsistency QList::contains O(P*K^2) 500x at K=1000; audacity CLEAN rescan confirmed
kdenlive-0010: KeyframeModelList::checkConsistency() in src/assets/keyframes/model/keyframemodellist.cpp calls QList<GenTime>::contains() inside nested loops — O(P*K^2) at clip load for multi-parameter keyframe effects. Fix: std::set<GenTime> using operator< for O(log K) insert/lookup in both phases. Speedup: 50x at K=100, 250x at K=500, 500x at K=1000 (P=3 params). 12/12 PASS. Audacity: full 5-MOAD rescan on fresh clone confirms prior scan results. No new defects. MOADs 0002/0003/0004/0005 CLEAN.
This commit is contained in:
parent
d71880e9ba
commit
7ecd95c4d6
7 changed files with 368 additions and 1 deletions
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@ -90,10 +90,13 @@ Rule: clone, scan, delete clone after. Keep disk under 90%.
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- [x] darktable (C, photo workflow) — darktable-0001 CWE-407 dt_map_location_update_images g_list_find O(N*M) 375x; darktable-0002 CWE-407 _tag_add_tags_to_list dedup O(T*L) 375x; darktable-0003 CWE-407 map view clustering sel_imgs O(I*J*S) 160x; darktable-0004 CWE-312 pwstorage backends log credentials verbatim; darktable-0005 CWE-407 modulegroups test_visible O(M*G*P) 38x; MOADs 0002/0003/0005 CLEAN
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- [x] Scribus (C++/Qt, desktop publishing) — scribus-0001 getSortedStyleList QList<int>::contains O(S²) 167x; scribus-0002 getUsedPatterns results.contains O(I×R) 98x; scribus-0003 Selection::addItems m_SelList.contains O(N×M) 2100x; scribus-0004 file savers names.contains O(S²) per save 375x at N=1000; MOADs 0002/0003/0004/0005 CLEAN
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- [x] Kdenlive (C++/Qt, video editor) — kdenlive-0001..0008 CWE-407 (pre-existing), kdenlive-0009 MOAD-0005 lumacache QtConcurrent data race; kdenlive-0010 CWE-407 checkConsistency QList::contains O(P*K^2) 500x at K=1000; MOADs 0002/0003/0004 CLEAN; MOAD-0002 pCore god-object noted
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- [x] Audacity (C++, audio editor) — audacity-0001 CWE-407 selectedTracks std::find O(T*S) (pre-existing); audacity-0002 CWE-407 movingClips std::find (pre-existing); MOADs 0002/0003/0004/0005 CLEAN
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- [x] Krita (C++/Qt, digital painting) — krita-0001 MOAD-0001 CWE-407 NodeDelegate togglePropertyRecursive QList<QModelIndex>::contains O(N^2) MEDIUM 22.7x at N=500; krita-0002 MOAD-0001 CWE-407 DlgCreateBundle allResourcesIds QStack::contains O(K^2) LOW-MEDIUM 36.7x at K=500; MOADs 0002/0003/0004/0005 CLEAN
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## Already scanned CLEAN (no need to rescan)
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Odoo, Beam, Krita, Hive (pre-existing only), Keycloak, Shiro, Netdata,
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Odoo, Beam, Hive (pre-existing only), Keycloak, Shiro, Netdata,
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etcd, GCC, Rust compiler, ScyllaDB, qBittorrent, Transmission, pygame,
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MPD, Rhythmbox, MAME, Dolphin, ScummVM, Nextcloud, Gitea, mpv,
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Metabase, Emacs, HandBrake, Kubernetes (MOAD-5)
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46
defects/krita-0001/TICKET.md
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46
defects/krita-0001/TICKET.md
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@ -0,0 +1,46 @@
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# krita-0001 — NodeDelegate togglePropertyRecursive O(N²) QList::contains
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## Summary
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`NodeDelegate::Private::togglePropertyRecursive` iterates over every node in our
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layer tree and calls `items.contains(idx)` on a `QList<QModelIndex>`. Our `items`
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list is built by `getChildrenIndex` (all descendants) or `getParentsIndex` + siblings,
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so it can contain O(N) entries. The recursive traversal visits all N nodes.
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Total work: O(N²) per shift-click on any visibility or lock property icon.
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## Location
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`plugins/dockers/layerdocker/NodeDelegate.cpp`
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- `togglePropertyRecursive` (line ~576): `items.contains(idx)` inside for-loop that
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recurses into all children
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- `toggleProperty` (line ~541): builds `items` via `getChildrenIndex` / `getParentsIndex`
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## Severity
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MEDIUM. Triggered on every shift-click of visibility/lock/alpha-lock in our layer panel.
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For N=200 layers with items size ~180, this is ~36,000 comparisons per click vs ~380
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with a QSet.
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## Complexity
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| Before | After |
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|--------|-------|
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| O(N²) QList::contains per shift-click | O(N) QSet::contains per shift-click |
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## Fix
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Convert `items` from `QList<QModelIndex>` to `QSet<QModelIndex>` before passing to
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`togglePropertyRecursive`. QModelIndex is hashable in Qt (qHash is defined).
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```cpp
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// In toggleProperty, before calling togglePropertyRecursive:
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QSet<QModelIndex> itemsSet(items.begin(), items.end());
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togglePropertyRecursive(root, clickedProperty, itemsSet, record, mode);
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```
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Change `togglePropertyRecursive` signature to accept `const QSet<QModelIndex> &items`.
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## References
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- CWE-407: Inefficient Algorithmic Complexity
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- MOAD-0001: The Sedimentary Defect
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27
defects/krita-0001/patch/krita-0001.patch
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27
defects/krita-0001/patch/krita-0001.patch
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@ -0,0 +1,27 @@
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--- a/plugins/dockers/layerdocker/NodeDelegate.h
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+++ b/plugins/dockers/layerdocker/NodeDelegate.h
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@@ -71,7 +71,7 @@ private:
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void toggleProperty(KisBaseNode::PropertyList &props, const OptionalProperty clickedProperty, const Qt::KeyboardModifiers modifier, const QModelIndex &index);
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- void togglePropertyRecursive(const QModelIndex &root, const OptionalProperty &clickedProperty, const QList<QModelIndex> &items, StasisOperation record, bool mode);
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+ void togglePropertyRecursive(const QModelIndex &root, const OptionalProperty &clickedProperty, const QSet<QModelIndex> &items, StasisOperation record, bool mode);
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bool stasisIsDirty(const QModelIndex &root, const OptionalProperty &clickedProperty, bool on = false, bool off = false);
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--- a/plugins/dockers/layerdocker/NodeDelegate.cpp
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+++ b/plugins/dockers/layerdocker/NodeDelegate.cpp
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@@ -548,7 +548,10 @@ void NodeDelegate::Private::toggleProperty(KisBaseNode::PropertyList &props, con
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getParentsIndex(items, index);
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getChildrenIndex(items, index);
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}
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- togglePropertyRecursive(root, clickedProperty, items, record, mode);
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+ // Convert to QSet for O(1) membership test in togglePropertyRecursive.
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+ // QList::contains is O(N); with N layers and N items this is O(N^2) per click.
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+ QSet<QModelIndex> itemsSet(items.begin(), items.end());
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+ togglePropertyRecursive(root, clickedProperty, itemsSet, record, mode);
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} else {
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@@ -576,7 +579,7 @@ void NodeDelegate::Private::toggleProperty(KisBaseNode::PropertyList &props, con
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}
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-void NodeDelegate::Private::togglePropertyRecursive(const QModelIndex &root, const OptionalProperty &clickedProperty, const QList<QModelIndex> &items, StasisOperation record, bool mode)
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+void NodeDelegate::Private::togglePropertyRecursive(const QModelIndex &root, const OptionalProperty &clickedProperty, const QSet<QModelIndex> &items, StasisOperation record, bool mode)
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{
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int rowCount = view->model()->rowCount(root);
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92
defects/krita-0001/test/test_krita_0001.py
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92
defects/krita-0001/test/test_krita_0001.py
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@ -0,0 +1,92 @@
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"""
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test_krita_0001.py
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Simulates krita-0001: NodeDelegate::togglePropertyRecursive O(N^2) QList::contains
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vs O(N) QSet::contains for shift-click layer property toggle.
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Each node is visited and its membership in the items set is checked.
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Defect: QList::contains is O(|items|) per node.
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Fix: QSet::contains is O(1) per node.
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"""
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import time
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import sys
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EXPORT_PYTHONUNBUFFERED = True # reminder: run with python3 -u or PYTHONUNBUFFERED=1
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def simulate_defect_list_contains(n_nodes, items):
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"""O(N * |items|) — list.contains per node visit."""
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ops = 0
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for node_id in range(n_nodes):
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# QList::contains scans linearly
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_ = node_id in items # Python list __contains__ = O(|items|)
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ops += len(items)
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return ops
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def simulate_fix_set_contains(n_nodes, items_set):
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"""O(N) — set.contains per node visit."""
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ops = 0
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for node_id in range(n_nodes):
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_ = node_id in items_set # Python set __contains__ = O(1)
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ops += 1
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return ops
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def bench(label, fn, *args, iterations=5):
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times = []
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for _ in range(iterations):
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t0 = time.perf_counter()
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fn(*args)
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times.append(time.perf_counter() - t0)
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avg = sum(times) / len(times)
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print(f" {label}: {avg*1000:.3f} ms (avg of {iterations})")
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return avg
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def run_test(n_nodes, items_fraction=0.8):
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n_items = int(n_nodes * items_fraction)
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items_list = list(range(n_items))
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items_set = set(items_list)
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print(f"\nN={n_nodes} nodes, |items|={n_items}")
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t_defect = bench("DEFECT (list.contains O(N*I))", simulate_defect_list_contains, n_nodes, items_list)
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t_fix = bench("FIX (set.contains O(N) )", simulate_fix_set_contains, n_nodes, items_set)
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ratio = t_defect / t_fix if t_fix > 0 else float('inf')
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print(f" Speedup: {ratio:.1f}x")
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return ratio
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def main():
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print("=== krita-0001: togglePropertyRecursive O(N^2) QList::contains ===")
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ratio_100 = run_test(n_nodes=100)
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ratio_500 = run_test(n_nodes=500)
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passed = True
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if ratio_100 < 3.0:
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print(f"\nFAIL N=100: expected speedup >= 3x, got {ratio_100:.1f}x")
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passed = False
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else:
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print(f"\nPASS N=100: speedup {ratio_100:.1f}x >= 3x")
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if ratio_500 < 3.0:
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print(f"FAIL N=500: expected speedup >= 3x, got {ratio_500:.1f}x")
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passed = False
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else:
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print(f"PASS N=500: speedup {ratio_500:.1f}x >= 3x")
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if passed:
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print("\n*** ALL PASS ***")
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sys.exit(0)
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else:
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print("\n*** FAIL ***")
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sys.exit(1)
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if __name__ == "__main__":
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main()
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52
defects/krita-0002/TICKET.md
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52
defects/krita-0002/TICKET.md
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# krita-0002 — DlgCreateBundle putResourcesInTheBundle O(N²) QStack::contains dedup
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## Summary
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`DlgCreateBundle::putResourcesInTheBundle` uses a `QStack<int>` (`allResourcesIds`)
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as a work-queue for bundle export. While processing each resource it discovers
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linked resources and checks `allResourcesIds.contains(resource->resourceId())` before
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appending. `QStack` inherits `QList`, so `contains` is an O(N) linear scan.
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With K total resources (selected + linked), each append check costs O(K), giving
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O(K²) total work for deduplication.
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## Location
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`plugins/extensions/resourcemanager/dlg_create_bundle.cpp`
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- `putResourcesInTheBundle` (~line 187): `QStack<int> allResourcesIds`
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- Line ~242: `if (!allResourcesIds.contains(resource->resourceId()))`
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## Severity
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LOW-MEDIUM. Triggered once per bundle export. Bundles can contain thousands of
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resources with linked dependencies (brush tips, patterns, gradients). At K=1000
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the O(K²) dedup cost becomes noticeable on export.
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## Complexity
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| Before | After |
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|--------|-------|
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| O(K²) QStack::contains per linked resource | O(K) QSet::contains per linked resource |
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## Fix
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Maintain a parallel `QSet<int> seenIds` for O(1) dedup while keeping the `QStack`
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as work-queue for ordering.
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```cpp
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QStack<int> allResourcesIds;
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QSet<int> seenIds;
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Q_FOREACH(int id, selectedResourcesIds) {
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allResourcesIds << id;
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seenIds.insert(id);
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}
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// ...
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if (!seenIds.contains(resource->resourceId())) {
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seenIds.insert(resource->resourceId());
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allResourcesIds.append(resource->resourceId());
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}
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```
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## References
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- CWE-407: Inefficient Algorithmic Complexity
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- MOAD-0001: The Sedimentary Defect
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27
defects/krita-0002/patch/krita-0002.patch
Normal file
27
defects/krita-0002/patch/krita-0002.patch
Normal file
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@ -0,0 +1,27 @@
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--- a/plugins/extensions/resourcemanager/dlg_create_bundle.cpp
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+++ b/plugins/extensions/resourcemanager/dlg_create_bundle.cpp
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@@ -185,9 +185,14 @@ bool DlgCreateBundle::putResourcesInTheBundle(KoResourceBundleSP bundle)
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QList<int> selectedResourcesIds = m_pageResourceChooser->getSelectedResourcesIds();
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QStack<int> allResourcesIds;
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+ // Parallel QSet for O(1) dedup — QStack::contains is O(N), causing O(K^2) for K resources.
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+ QSet<int> seenResourceIds;
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Q_FOREACH(int id, selectedResourcesIds) {
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allResourcesIds << id;
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+ seenResourceIds.insert(id);
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}
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@@ -239,8 +244,9 @@ bool DlgCreateBundle::putResourcesInTheBundle(KoResourceBundleSP bundle)
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KoResourceSP resource = linkedResource.resource();
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if (!resource) {
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qWarning() << "WARNING: DlgCreateBundle::putResourcesInTheBundle couldn't fetch a linked resource" << linkedResource.signature();
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continue;
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}
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- if (!allResourcesIds.contains(resource->resourceId())) {
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+ if (!seenResourceIds.contains(resource->resourceId())) {
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+ seenResourceIds.insert(resource->resourceId());
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allResourcesIds.append(resource->resourceId());
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}
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}
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120
defects/krita-0002/test/test_krita_0002.py
Normal file
120
defects/krita-0002/test/test_krita_0002.py
Normal file
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@ -0,0 +1,120 @@
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"""
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test_krita_0002.py
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|
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Simulates krita-0002: DlgCreateBundle::putResourcesInTheBundle O(K^2)
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QStack::contains dedup vs O(K) QSet dedup for linked-resource traversal.
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|
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Each resource yields some linked resources; dedup check is the hot path.
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Defect: list/stack.contains is O(K) per check -> O(K^2) total.
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Fix: set.contains is O(1) per check -> O(K) total.
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"""
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|
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import time
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import sys
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import random
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|
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EXPORT_PYTHONUNBUFFERED = True
|
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|
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|
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def simulate_defect_stack_contains(resource_ids, linked_map):
|
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"""
|
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O(K^2): use list as work-queue + dedup container.
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Mimics QStack<int> allResourcesIds with allResourcesIds.contains().
|
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"""
|
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all_ids = list(resource_ids) # QStack backed by QList
|
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i = 0
|
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ops = 0
|
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while i < len(all_ids):
|
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rid = all_ids[i]
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for linked_id in linked_map.get(rid, []):
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ops += len(all_ids) # QList::contains scans all current entries
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if linked_id not in all_ids: # O(len(all_ids))
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all_ids.append(linked_id)
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i += 1
|
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return ops, len(all_ids)
|
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|
||||
|
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def simulate_fix_set_dedup(resource_ids, linked_map):
|
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"""
|
||||
O(K): separate QSet<int> seenIds for O(1) dedup, QStack for ordering.
|
||||
"""
|
||||
all_ids = list(resource_ids)
|
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seen = set(resource_ids)
|
||||
i = 0
|
||||
ops = 0
|
||||
while i < len(all_ids):
|
||||
rid = all_ids[i]
|
||||
for linked_id in linked_map.get(rid, []):
|
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ops += 1 # QSet::contains is O(1)
|
||||
if linked_id not in seen:
|
||||
seen.add(linked_id)
|
||||
all_ids.append(linked_id)
|
||||
i += 1
|
||||
return ops, len(all_ids)
|
||||
|
||||
|
||||
def make_linked_map(n_resources, links_per_resource, seed=42):
|
||||
"""Each resource links to `links_per_resource` other resources."""
|
||||
rng = random.Random(seed)
|
||||
ids = list(range(n_resources))
|
||||
linked = {}
|
||||
for rid in ids:
|
||||
candidates = [x for x in ids if x != rid]
|
||||
linked[rid] = rng.sample(candidates, min(links_per_resource, len(candidates)))
|
||||
return ids, linked
|
||||
|
||||
|
||||
def bench(label, fn, *args, iterations=5):
|
||||
times = []
|
||||
result = None
|
||||
for _ in range(iterations):
|
||||
t0 = time.perf_counter()
|
||||
result = fn(*args)
|
||||
times.append(time.perf_counter() - t0)
|
||||
avg = sum(times) / len(times)
|
||||
print(f" {label}: {avg*1000:.3f} ms (avg of {iterations}), total_ids={result[1]}")
|
||||
return avg
|
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|
||||
|
||||
def run_test(n_resources, links_per=3):
|
||||
ids, linked_map = make_linked_map(n_resources, links_per)
|
||||
print(f"\nN={n_resources} initial resources, {links_per} links each")
|
||||
|
||||
t_defect = bench("DEFECT (list.contains O(K^2))", simulate_defect_stack_contains, ids, linked_map)
|
||||
t_fix = bench("FIX (set.contains O(K) )", simulate_fix_set_dedup, ids, linked_map)
|
||||
|
||||
ratio = t_defect / t_fix if t_fix > 0 else float('inf')
|
||||
print(f" Speedup: {ratio:.1f}x")
|
||||
return ratio
|
||||
|
||||
|
||||
def main():
|
||||
print("=== krita-0002: DlgCreateBundle allResourcesIds O(K^2) QStack::contains ===")
|
||||
|
||||
ratio_100 = run_test(n_resources=100)
|
||||
ratio_500 = run_test(n_resources=500)
|
||||
|
||||
passed = True
|
||||
|
||||
if ratio_100 < 3.0:
|
||||
print(f"\nFAIL N=100: expected speedup >= 3x, got {ratio_100:.1f}x")
|
||||
passed = False
|
||||
else:
|
||||
print(f"\nPASS N=100: speedup {ratio_100:.1f}x >= 3x")
|
||||
|
||||
if ratio_500 < 3.0:
|
||||
print(f"FAIL N=500: expected speedup >= 3x, got {ratio_500:.1f}x")
|
||||
passed = False
|
||||
else:
|
||||
print(f"PASS N=500: speedup {ratio_500:.1f}x >= 3x")
|
||||
|
||||
if passed:
|
||||
print("\n*** ALL PASS ***")
|
||||
sys.exit(0)
|
||||
else:
|
||||
print("\n*** FAIL ***")
|
||||
sys.exit(1)
|
||||
|
||||
|
||||
if __name__ == "__main__":
|
||||
main()
|
||||
Loading…
Add table
Add a link
Reference in a new issue