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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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Fix accumulator type
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@mdickinson
mdickinson committed Sep 10, 2022
commit 204e924c85e04b8ea8186c1dfa9cf4618063b127
2 changes: 1 addition & 1 deletion Modules/_struct.c
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Original file line number Diff line number Diff line change
Expand Up @@ -824,7 +824,7 @@ bu_short(_structmodulestate *state, const char *p, const formatdef *f)
static PyObject *
bu_int(_structmodulestate *state, const char *p, const formatdef *f)
{
long x = 0;
unsigned long x = 0;

/* This function is only ever used in the case f->size == 4. */
assert(f->size == 4);
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