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gh-102701: Fix overflow in dictobject.c (GH-102750)

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(cherry picked from commit 65fb7c4055)

Co-authored-by: Inada Naoki <songofacandy@gmail.com>
This commit is contained in:
Miss Islington (bot) 2023-03-17 07:54:18 -07:00 • committed by GitHub
parent d025b1d278
commit f967aee4fb
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3 changed files with 11 additions and 1 deletions
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9
Lib/test/test_bigmem.py
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@ -1248,6 +1248,15 @@ class ListTest(unittest.TestCase):
self.assertEqual(l[-10:], [5] * 10)
class DictTest(unittest.TestCase):
@bigmemtest(size=357913941, memuse=160)
def test_dict(self, size):
# https://github.com/python/cpython/issues/102701
d = dict.fromkeys(range(size))
d[size] = 1
if __name__ == '__main__':
if len(sys.argv) > 1:
support.set_memlimit(sys.argv[1])

1
Misc/NEWS.d/next/Core and Builtins/2023-03-16-17-24-44.gh-issue-102701.iNGVaS.rst Normal file
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@ -0,0 +1 @@
Fix overflow when creating very large dict.

2
Objects/dictobject.c
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@ -600,7 +600,7 @@ new_keys_object(uint8_t log2_size, bool unicode)
assert(log2_size >= PyDict_LOG_MINSIZE);
usable = USABLE_FRACTION(1<<log2_size);
usable = USABLE_FRACTION((size_t)1<<log2_size);
if (log2_size < 8) {
log2_bytes = log2_size;
}