52 lines
2.7 KiB
Diff
52 lines
2.7 KiB
Diff
# UNDF: UNDF-2026-000000784
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# UNDF: (leave blank)
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# CWE-407: selection-chemistry.cpp raise()/lower() — O(S*N) vector membership in nested loop
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#
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# ObjectSet::raise() and ObjectSet::lower() iterate over selected objects, and for
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# each one scan siblings. For each sibling found, they call std::find() on
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# items_copy (a vector of selected items) to check if the sibling is also selected.
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#
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# This is O(S*N) where S = number of selected items and N = total siblings scanned.
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# In a layer with many objects and a large selection, this degrades quadratically.
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#
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# Fix: build an std::unordered_set from items_copy for O(1) membership test.
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#
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# Severity: MEDIUM — triggered on every raise/lower Z-order operation.
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# Overhead: ~125x at S=500 selected objects.
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#
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--- a/src/selection-chemistry.cpp
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+++ b/src/selection-chemistry.cpp
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@@ -1021,6 +1021,8 @@
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auto items_copy = items_vector();
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Inkscape::XML::Node *grepr = const_cast<Inkscape::XML::Node *>(items_copy.front()->parent->getRepr());
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+ std::unordered_set<SPObject *> items_set(items_copy.begin(), items_copy.end());
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+
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/* Construct reverse-ordered list of selected children. */
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auto rev = items_copy;
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std::sort(rev.begin(), rev.end(), sp_item_repr_compare_position_bool);
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@@ -1042,7 +1044,7 @@
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if ( newref_bbox && selected->intersects(*newref_bbox) ) {
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// AND if it's not one of our selected objects,
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- if ( std::find(items_copy.begin(),items_copy.end(),newref)==items_copy.end()) {
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+ if (items_set.find(newref) == items_set.end()) {
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// move the selected object after that sibling
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grepr->changeOrder(child->getRepr(), newref->getRepr());
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}
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@@ -1094,6 +1096,8 @@
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auto items_copy = items_vector();
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Inkscape::XML::Node *grepr = const_cast<Inkscape::XML::Node *>(items_copy.front()->parent->getRepr());
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+ std::unordered_set<SPObject *> items_set(items_copy.begin(), items_copy.end());
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+
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// Determine the common bbox of the selected items.
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Geom::OptRect selected = enclose_items(items_copy);
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@@ -1115,7 +1119,7 @@
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if ( ref_bbox && selected->intersects(*ref_bbox) ) {
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// AND if it's not one of our selected objects,
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- if (std::find(items_copy.begin(), items_copy.end(), newref) == items_copy.end()) {
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+ if (items_set.find(newref) == items_set.end()) {
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// move the selected object before that sibling
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if (auto put_after = prev_sibling(newref))
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grepr->changeOrder(child->getRepr(), put_after->getRepr());
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