bpo-35766 follow-up: Add an error check to new_type_comment() (#11766)
If PyUnicode_DecodeUTF8() returns NULL, PyArena_AddPyObject() would crash.
Found by @msullivan for https://github.com/python/typed_ast/pull/93.
diff --git a/Python/ast.c b/Python/ast.c
index 76588c3..5cef3fd 100644
--- a/Python/ast.c
+++ b/Python/ast.c
@@ -702,6 +702,8 @@
new_type_comment(const char *s, struct compiling *c)
{
PyObject *res = PyUnicode_DecodeUTF8(s, strlen(s), NULL);
+ if (res == NULL)
+ return NULL;
if (PyArena_AddPyObject(c->c_arena, res) < 0) {
Py_DECREF(res);
return NULL;