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gh-102356: Add thrashcan macros to filter object dealloc (GH-102426)

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Add thrashcan macros to the deallocator of the filter objects to protect against deeply nested destruction of chains of nested filters.
(cherry picked from commit 66aa78cbe6)

Co-authored-by: Marta Gómez Macías <mgmacias@google.com>
This commit is contained in:
Miss Islington (bot) 2023-03-05 03:25:48 -08:00 • committed by GitHub
parent caff048cb3
commit 63fd954100
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4 changed files with 15 additions and 0 deletions
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10
Lib/test/test_builtin.py
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@ -919,6 +919,16 @@ class BuiltinTest(unittest.TestCase):
f2 = filter(filter_char, "abcdeabcde")
self.check_iter_pickle(f1, list(f2), proto)
def test_filter_dealloc(self):
# Tests recursive deallocation of nested filter objects using the
# thrashcan mechanism. See gh-102356 for more details.
max_iters = 1000000
i = filter(bool, range(max_iters))
for _ in range(max_iters):
i = filter(bool, i)
del i
gc.collect()
def test_getattr(self):
self.assertTrue(getattr(sys, 'stdout') is sys.stdout)
self.assertRaises(TypeError, getattr)