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bpo-36946: Fix possible signed integer overflow when handling slices. (GH-13375)

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The final addition (cur += step) may overflow, so use size_t for "cur".
"cur" is always positive (even for negative steps), so it is safe to use
size_t here.

Co-Authored-By: Martin Panter <vadmium+py@gmail.com>
This commit is contained in:
Zackery Spytz 2019-05-17 01:13:03 -06:00 • committed by Serhiy Storchaka
parent 870b035bc6
commit 14514d9084
15 changed files with 45 additions and 19 deletions
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2
Lib/test/string_tests.py
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@ -1135,7 +1135,7 @@ class MixinStrUnicodeUserStringTest:
def test_extended_getslice(self):
# Test extended slicing by comparing with list slicing.
s = string.ascii_letters + string.digits
indices = (0, None, 1, 3, 41, -1, -2, -37)
indices = (0, None, 1, 3, 41, sys.maxsize, -1, -2, -37)
for start in indices:
for stop in indices:
# Skip step 0 (invalid)