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

miss-islington · serhiy-storchaka · web-flow · commit 73e3510bdb27 · 2022-10-05T03:20:32.000-07:00
(cherry picked from commit f8cbd79) Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
diff --git 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 *));

Original file line number	Diff line number	Diff line change
`@@ -261,7 +261,7 @@ getpath_joinpath(PyObject Py_UNUSED(self), PyObject args)`
`261`	`261`	`}`
`262`	`262`	`Py_ssize_t n = PyTuple_GET_SIZE(args);`
`263`	`263`	`if (n == 0) {`
`264`		`- return PyUnicode_FromString(NULL);`
	`264`	`+ return PyUnicode_FromStringAndSize(NULL, 0);`
`265`	`265`	`}`
`266`	`266`	`/* Convert all parts to wchar and accumulate max final length */`
`267`	`267`	`wchar_t parts = (wchar_t )PyMem_Malloc(n * sizeof(wchar_t *));`