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gh-96735: Fix undefined behaviour in struct unpacking functions #96739

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Merged
mdickinson merged 10 commits into from
Sep 25, 2022
Merged

gh-96735: Fix undefined behaviour in struct unpacking functions #96739

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22fdce6
Fix undefined behaviour in bu_ulonglong
mdickinson Sep 10, 2022
e12943b
Add regression test
mdickinson Sep 10, 2022
8efefd8
Also apply the fix to lu_longlong
mdickinson Sep 10, 2022
cba4b8b
Merge branch 'main' into fix-struct-unpack-undefined-behaviour
mdickinson Sep 10, 2022
0d49e73
Fix similar undefined behaviour issues in bu_int and lu_int
mdickinson Sep 10, 2022
bfd714f
Merge remote-tracking branch 'mdickinson/fix-struct-unpack-undefined-…
mdickinson Sep 10, 2022
5aeef09
Remove redundant test
mdickinson Sep 10, 2022
204e924
Fix accumulator type
mdickinson Sep 10, 2022
994703e
Branch-free sign-extension
mdickinson Sep 13, 2022
1294440
Fix unconventional spacing
mdickinson Sep 13, 2022
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Add regression test
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@mdickinson
mdickinson committed Sep 10, 2022
commit e12943b091dfb3e9b606f415024dfdd28caf3ba1
7 changes: 7 additions & 0 deletions Lib/test/test_struct.py
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Original file line number Diff line number Diff line change
Expand Up @@ -726,6 +726,13 @@ def test_issue45034_signed(self):
with self.assertRaisesRegex(struct.error, error_msg):
struct.pack('h', -70000) # too small

def test_long_long_unpack_undefined_behaviour(self):
# Regression test for python/cpython#96735.
self.assertEqual(
struct.unpack('!q', b'\xff\xff\xff\xff\xff\xff\xff\xff'),
(-1,)
)


class UnpackIteratorTest(unittest.TestCase):
"""
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