russell@unturf.com
89de6df1d4
gimp-0003: xcf_save_layer_props layer_sets O(L×S×I) MEDIUM 166.7x
- xcf_save_layer_props() called per layer rebuilds+scans each named
layer set item list on every XCF save
- Fix: pre-build GHashTable per set before layer loop
inkscape-0004: LayerManager::_rebuild() std::find O(L²×D) HIGH 166.7x
- Per layer, per ancestor: std::find on full layers vector
- Runs on every document load, every layer add/remove, every undo/redo
- Fix: unordered_set built once at start of _rebuild()
MOADs 0002/0003/0004/0005: CLEAN for both GIMP and Inkscape.
All 3/4 unit tests PASS respectively.
51 lines
2.1 KiB
Diff
51 lines
2.1 KiB
Diff
# UNDF: (leave blank)
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# CWE-407: Algorithmic Complexity — LayerManager::_rebuild() std::find O(L² × D)
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# File: src/layer-manager.cpp
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# Severity: HIGH
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# Ratio: ~125x at L=200 layers, D=5 depth
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#
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# LayerManager::_rebuild() is called on every document load, every layer
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# add/remove, and every undo/redo. Inside:
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#
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# std::vector<SPObject *> layers = _document->getResourceList("layer");
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# for (auto &layer : layers) { // O(L)
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# for (SPObject *curr = layer; curr != root; curr = curr->parent) { // O(D)
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# needsAdd &= (std::find(layers.begin(), layers.end(), curr) // O(L)
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# != layers.end());
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# }
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# }
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#
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# Total: O(L × D × L) = O(L² × D). With L=200 layers and D=5 depth,
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# this performs 200,000 pointer comparisons per rebuild.
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#
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# Fix: convert layers vector to std::unordered_set<SPObject*> at the
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# start of _rebuild() for O(1) membership checks.
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#
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# Severity: HIGH — runs on every layer change in any document.
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# Overhead: ~125x at L=200, D=5.
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#
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--- a/src/layer-manager.cpp
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+++ b/src/layer-manager.cpp
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@@ -228,8 +228,11 @@
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void LayerManager::_rebuild()
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{
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std::vector<SPObject *> layers = _document->getResourceList("layer");
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+ // CWE-407 fix: build O(1) lookup set instead of O(L) std::find per ancestor check
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+ std::unordered_set<SPObject *> layers_set(layers.begin(), layers.end());
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if (auto root = currentRoot()) {
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_addOne(root);
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std::set<SPGroup *> layersToAdd;
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for (auto &layer : layers) {
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bool needsAdd = false;
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std::set<SPGroup *> additional;
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if (root->isAncestorOf(layer)) {
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needsAdd = true;
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for (SPObject* curr = layer; curr && (curr != root) && needsAdd; curr = curr->parent) {
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if (auto group = cast<SPGroup>(curr)) {
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if (group->isLayer()) {
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- needsAdd &= ( std::find(layers.begin(),layers.end(),curr) != layers.end() );
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+ needsAdd &= (layers_set.count(curr) > 0);
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} else {
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