Add a safeguard against setting the class to something with a
different free or alloc slot.
diff --git a/Objects/typeobject.c b/Objects/typeobject.c
index 9a20fa4..61cbeae 100644
--- a/Objects/typeobject.c
+++ b/Objects/typeobject.c
@@ -1622,6 +1622,16 @@
return -1;
}
new = (PyTypeObject *)value;
+ if (new->tp_dealloc != old->tp_dealloc ||
+ new->tp_free != old->tp_free)
+ {
+ PyErr_Format(PyExc_TypeError,
+ "__class__ assignment: "
+ "'%s' deallocator differs from '%s'",
+ new->tp_name,
+ old->tp_name);
+ return -1;
+ }
newbase = new;
oldbase = old;
while (equiv_structs(newbase, newbase->tp_base))