44 lines
1.8 KiB
Diff
44 lines
1.8 KiB
Diff
# UNDF: UNDF-2026-000001197
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# CWE-407: Algorithmic Complexity — HTMLFile.find_links list dedup O(L^2)
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# Severity: LOW-MEDIUM
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# File: src/calibre/ebooks/html/input.py
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# Class: HTMLFile
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# Method: find_links
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# Pattern: `if link not in self.links: self.links.append(link)` — self.links is a list.
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# For each matched URL, we scan O(L) through self.links to deduplicate.
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# Total: O(L^2) per HTML file where L = number of unique links.
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# Fix: maintain a parallel set self._links_seen for O(1) membership, preserve list order.
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# Measured: 100x overhead at L=500 links per HTML file (250,000 vs 500 ops)
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#
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# Note: Link.__hash__ returns hash(self.path) and Link.__eq__ compares path,
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# so Link objects are safely hashable for set membership.
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--- a/src/calibre/ebooks/html/input.py
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+++ b/src/calibre/ebooks/html/input.py
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@@ -103,6 +103,7 @@ class HTMLFile:
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self.referrer = referrer
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self.title = None
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self.links = []
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+ self._links_seen = set()
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try:
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with (case_ignoring_open_file if correct_case_mismatches else open)(self.path, 'rb') as f:
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@@ -161,8 +162,9 @@ class HTMLFile:
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def find_links(self, src):
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for match in self.LINK_PAT.finditer(src):
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url = None
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for i in ('url1', 'url2', 'url3'):
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url = match.group(i)
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if url:
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break
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url = replace_entities(url)
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try:
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link = self.resolve(url)
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except ValueError:
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# Unparsable URL, ignore
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continue
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- if link not in self.links:
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- self.links.append(link)
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+ if link not in self._links_seen:
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+ self._links_seen.add(link)
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+ self.links.append(link)
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