[Python-checkins] gh-97758: Fix a crash in getpath_joinpath() called without arguments (GH-97759)

[serhiy-storchaka]

https://github.com/python/cpython/commit/f8cbd79d328d90443acabc41d246332c302c815a
commit: f8cbd79d328d90443acabc41d246332c302c815a
branch: main
author: Serhiy Storchaka <storchaka at gmail.com>
committer: serhiy-storchaka <storchaka at gmail.com>
date: 2022-10-05T12:51:58+03:00
summary:

gh-97758: Fix a crash in getpath_joinpath() called without arguments (GH-97759)

files:
M Modules/getpath.c

diff --git a/Modules/getpath.c b/Modules/getpath.c
index be704adbde94..ceacf36d8968 100644
--- a/Modules/getpath.c
+++ b/Modules/getpath.c
@@ -261,7 +261,7 @@ getpath_joinpath(PyObject *Py_UNUSED(self), PyObject *args)
     }
     Py_ssize_t n = PyTuple_GET_SIZE(args);
     if (n == 0) {
-        return PyUnicode_FromString(NULL);
+        return PyUnicode_FromStringAndSize(NULL, 0);
     }
     /* Convert all parts to wchar and accumulate max final length */
     wchar_t **parts = (wchar_t **)PyMem_Malloc(n * sizeof(wchar_t *));