gh-151763: Fix NULL dereference in os._path_normpath() under OOM (GH-151779)

zainnadeem786 · miss-islington · commit bd3482d05028 · 2026-06-24T15:56:59.000Z
(cherry picked from commit ce8b81f) Co-authored-by: Zain Nadeem <zainnadeemzainnadeem80@gmail.com>
diff --git a/Modules/posixmodule.c b/Modules/posixmodule.c
@@ -6145,6 +6145,9 @@ os__path_normpath_impl(PyObject *module, path_t *path)
     else {
         result = PyUnicode_FromWideChar(norm_path, norm_len);
     }
+    if (result == NULL) {
+        return NULL;
+    }
     if (PyBytes_Check(path->object)) {
         Py_SETREF(result, PyUnicode_EncodeFSDefault(result));
     }

Original file line number	Diff line number	Diff line change
`@@ -6145,6 +6145,9 @@ os__path_normpath_impl(PyObject module, path_t path)`
`6145`	`6145`	`else {`
`6146`	`6146`	`result = PyUnicode_FromWideChar(norm_path, norm_len);`
`6147`	`6147`	`}`
	`6148`	`+ if (result == NULL) {`
	`6149`	`+ return NULL;`
	`6150`	`+ }`
`6148`	`6151`	`if (PyBytes_Check(path->object)) {`
`6149`	`6152`	`Py_SETREF(result, PyUnicode_EncodeFSDefault(result));`
`6150`	`6153`	`}`