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gh-126595: fix a crash when calling `itertools.count(sys.maxsize)` (#126617)

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Bénédikt Tran 2024-11-12 14:10:10 +01:00 committed by GitHub
parent 37c57dfad1
commit 6e3bb8a913
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3 changed files with 13 additions and 0 deletions
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8
Lib/test/test_itertools.py
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@ -494,6 +494,8 @@ class TestBasicOps(unittest.TestCase):
self.assertEqual(take(2, zip('abc',count(-3))), [('a', -3), ('b', -2)])
self.assertRaises(TypeError, count, 2, 3, 4)
self.assertRaises(TypeError, count, 'a')
self.assertEqual(take(3, count(maxsize)),
[maxsize, maxsize + 1, maxsize + 2])
self.assertEqual(take(10, count(maxsize-5)),
list(range(maxsize-5, maxsize+5)))
self.assertEqual(take(10, count(-maxsize-5)),
@ -540,6 +542,12 @@ class TestBasicOps(unittest.TestCase):
self.assertEqual(take(20, count(-maxsize-15, 3)), take(20, range(-maxsize-15,-maxsize+100, 3)))
self.assertEqual(take(3, count(10, maxsize+5)),
list(range(10, 10+3*(maxsize+5), maxsize+5)))
self.assertEqual(take(3, count(maxsize, 2)),
[maxsize, maxsize + 2, maxsize + 4])
self.assertEqual(take(3, count(maxsize, maxsize)),
[maxsize, 2 * maxsize, 3 * maxsize])
self.assertEqual(take(3, count(-maxsize, maxsize)),
[-maxsize, 0, maxsize])
self.assertEqual(take(3, count(2, 1.25)), [2, 3.25, 4.5])
self.assertEqual(take(3, count(2, 3.25-4j)), [2, 5.25-4j, 8.5-8j])
self.assertEqual(take(3, count(Decimal('1.1'), Decimal('.1'))),

2
Misc/NEWS.d/next/Library/2024-11-09-10-31-10.gh-issue-126595.A-7MyC.rst Normal file
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@ -0,0 +1,2 @@
Fix a crash when instantiating :class:`itertools.count` with an initial
count of :data:`sys.maxsize` on debug builds. Patch by Bénédikt Tran.

3
Modules/itertoolsmodule.c
View File

@ -3291,6 +3291,9 @@ itertools_count_impl(PyTypeObject *type, PyObject *long_cnt,
PyErr_Clear();
fast_mode = 0;
}
else if (cnt == PY_SSIZE_T_MAX) {
fast_mode = 0;
}
}
} else {
cnt = 0;