commit ebc793d6acb9650b9f497808e059805892031d74
author Zackery Spytz <zspytz@gmail.com> Thu Feb 21 00:47:14 2019 -0700
committer Serhiy Storchaka <storchaka@gmail.com> Thu Feb 21 09:47:14 2019 +0200
tree 4dfe8f5ecea05d788c6f27dfed54975331abc40d
parent ef1b88bf57aae93893d55f1b9c9639dbe9cc7786

bpo-33989: Ensure that ms.key_compare is always initialized in list_sort_impl(). (GH-8710)

Objects/listobject.c

diff --git a/Objects/listobject.c b/Objects/listobject.c
index a08b3b5..cbd6e81 100644
--- a/Objects/listobject.c
+++ b/Objects/listobject.c
@@ -2334,6 +2334,9 @@
             else if ((ms.key_richcompare = key_type->tp_richcompare) != NULL) {
                 ms.key_compare = unsafe_object_compare;
             }
+            else {
+                ms.key_compare = safe_object_compare;
+            }
         }
         else {
             ms.key_compare = safe_object_compare;