1 files changed, 8 insertions, 3 deletions
diff --git a/Objects/bytearrayobject.c b/Objects/bytearrayobject.c
index 2a675d5..c7fe8b2 100644
--- a/Objects/bytearrayobject.c
+++ b/Objects/bytearrayobject.c
@@ -2442,11 +2442,16 @@ static PyObject *
 bytearrayiter_reduce(bytesiterobject *it, PyObject *Py_UNUSED(ignored))
 {
     _Py_IDENTIFIER(iter);
+    PyObject *iter = _PyEval_GetBuiltinId(&PyId_iter);
+
+    /* _PyEval_GetBuiltinId can invoke arbitrary code,
+     * call must be before access of iterator pointers.
+     * see issue #101765 */
+
     if (it->it_seq != NULL) {
-        return Py_BuildValue("N(O)n", _PyEval_GetBuiltinId(&PyId_iter),
-                             it->it_seq, it->it_index);
+        return Py_BuildValue("N(O)n", iter, it->it_seq, it->it_index);
     } else {
-        return Py_BuildValue("N(())", _PyEval_GetBuiltinId(&PyId_iter));
+        return Py_BuildValue("N(())", iter);
     }
 }