pythongh-106917: fix super classmethod calls to non-classmethods

Lib/test/test_super.py

@@ -422,6 +422,45 @@ def test(name):
         test("foo1")
         test("foo2")
 
+    def test_reassigned_new(self):
+        class A:
+            def __new__(cls):
+                pass
+
+            def __init_subclass__(cls):
+                if "__new__" not in cls.__dict__:
+                    cls.__new__ = cls.__new__
+
+        class B(A):
+            pass
+
+        class C(B):
+            def __new__(cls):
+                return super().__new__(cls)
+
+        C()
+        C()
+
+    def test_mixed_staticmethod_hierarchy(self):
+        # This test is just a desugared version of `test_reassigned_new`
+        class A:
+            @staticmethod
+            def some(cls, *args, **kwargs):
+                self.assertFalse(args)
+                self.assertFalse(kwargs)
+
+        class B(A):
+            def some(cls, *args, **kwargs):
+                return super().some(cls, *args, **kwargs)
+
+        class C(B):
+            @staticmethod
+            def some(cls):
+                return super().some(cls)
+
+        C.some(C)
+        C.some(C)
+
 
 if __name__ == "__main__":
     unittest.main()

Misc/NEWS.d/next/Core and Builtins/2023-07-21-14-37-48.gh-issue-106917.1jWp_m.rst

@@ -0,0 +1,4 @@
+Fix classmethod-style :func:`super` method calls (i.e., where the second
+argument to :func:`super`, or the implied second argument drawn from
+``self/cls`` in the case of zero-arg super, is a type) when the target of
+the call is not a classmethod.

Python/bytecodes.c

@@ -1720,7 +1720,7 @@ dummy_func(
             PyTypeObject *cls = (PyTypeObject *)class;
             int method_found = 0;
             res2 = _PySuper_Lookup(cls, self, name,
-                                   cls->tp_getattro == PyObject_GenericGetAttr ? &method_found : NULL);
+                                   Py_TYPE(self)->tp_getattro == PyObject_GenericGetAttr ? &method_found : NULL);
             Py_DECREF(global_super);
             Py_DECREF(class);
             if (res2 == NULL) {