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[3.14] gh-127971: fix off-by-one read beyond the end of a string during search (GH-132574) (#136628)

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gh-127971: fix off-by-one read beyond the end of a string during search (GH-132574)
(cherry picked from commit 85ec3b3b50)

Co-authored-by: Duane Griffin <duaneg@dghda.com>
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Miss Islington (bot) 2025-07-13 15:58:03 +02:00 • committed by GitHub
parent ed1e0cdc58
commit 348e22cf06
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3 changed files with 14 additions and 4 deletions
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9
Lib/test/string_tests.py
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@ -767,6 +767,15 @@ def test_replace(self):
self.checkraises(TypeError, 'hello', 'replace', 42, 'h')
self.checkraises(TypeError, 'hello', 'replace', 'h', 42)
def test_replacement_on_buffer_boundary(self):
# gh-127971: Check we don't read past the end of the buffer when a
# potential match misses on the last character.
any_3_nonblank_codepoints = '!!!'
seven_codepoints = any_3_nonblank_codepoints + ' ' + any_3_nonblank_codepoints
a = (' ' * 243) + seven_codepoints + (' ' * 7)
b = ' ' * 6 + chr(256)
a.replace(seven_codepoints, b)
def test_replace_uses_two_way_maxcount(self):
# Test that maxcount works in _two_way_count in fastsearch.h
A, B = "A"*1000, "B"*1000