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gh-154176: Fix locale.strxfrm() crash on DragonFly BSD #154177

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Merged
serhiy-storchaka merged 1 commit into from
Jul 20, 2026
Merged

gh-154176: Fix locale.strxfrm() crash on DragonFly BSD #154177

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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Library/2026-07-19-21-30-00.gh-issue-154176.strxfrm.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,2 @@
Fix a crash in :func:`locale.strxfrm` on DragonFly BSD,
whose ``wcsxfrm()`` does not support the zero size.
5 changes: 4 additions & 1 deletion Modules/_localemodule.c
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Expand Up @@ -443,6 +443,7 @@ _locale_strxfrm_impl(PyObject *module, PyObject *str)
{
Py_ssize_t n1;
wchar_t *s = NULL, *buf = NULL;
wchar_t dummy[1];
size_t n2;
PyObject *result = NULL;

Expand All @@ -456,7 +457,9 @@ _locale_strxfrm_impl(PyObject *module, PyObject *str)
}

errno = 0;
n2 = wcsxfrm(NULL, s, 0);
/* Query the size with a real one-element buffer: DragonFly BSD's
wcsxfrm() crashes when the destination is NULL or the size is 0. */
n2 = wcsxfrm(dummy, s, 1);
if (errno && errno != ERANGE) {
PyErr_SetFromErrno(PyExc_OSError);
goto exit;
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