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gh-132909: handle overflow for 'K' format in do_mkvalue (#132911)

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Bénédikt Tran 2025-04-25 13:02:57 +02:00 • committed by GitHub
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3 changed files with 6 additions and 1 deletions
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2
Doc/c-api/arg.rst
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@ -669,6 +669,8 @@ Building values
``L`` (:class:`int`) [long long] ``L`` (:class:`int`) [long long]
Convert a C :c:expr:`long long` to a Python integer object. Convert a C :c:expr:`long long` to a Python integer object.
.. _capi-py-buildvalue-format-K:
``K`` (:class:`int`) [unsigned long long] ``K`` (:class:`int`) [unsigned long long]
Convert a C :c:expr:`unsigned long long` to a Python integer object. Convert a C :c:expr:`unsigned long long` to a Python integer object.

2
Misc/NEWS.d/next/C_API/2025-04-25-11-39-24.gh-issue-132909.JC3n_l.rst Normal file
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@ -0,0 +1,2 @@
Fix an overflow when handling the :ref:`K <capi-py-buildvalue-format-K>` format
in :c:func:`Py_BuildValue`. Patch by Bénédikt Tran.

3
Python/modsupport.c
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@ -321,7 +321,8 @@ do_mkvalue(const char **p_format, va_list *p_va)
return PyLong_FromLongLong((long long)va_arg(*p_va, long long)); return PyLong_FromLongLong((long long)va_arg(*p_va, long long));
case 'K': case 'K':
return PyLong_FromUnsignedLongLong((long long)va_arg(*p_va, unsigned long long)); return PyLong_FromUnsignedLongLong(
va_arg(*p_va, unsigned long long));
case 'u': case 'u':
{ {