commit 491bbedc209fea314a04cb3015da68fb0aa63238
author lekma <lekmalek@gmail.com> Wed May 02 11:29:10 2018 +0200
committer INADA Naoki <methane@users.noreply.github.com> Wed May 02 18:29:10 2018 +0900
tree b5914373e115eea5b7581a5c715bb2404fe26c1b
parent fc6aa28bfd0502d994cec30bd3679b7def3be2af

bpo-33391: Fix refleak in set_symmetric_difference (GH-6670)

Objects/setobject.c

diff --git a/Objects/setobject.c b/Objects/setobject.c
index 80101dd..82b5838 100644
--- a/Objects/setobject.c
+++ b/Objects/setobject.c
@@ -1744,8 +1744,10 @@
     if (otherset == NULL)
         return NULL;
     rv = set_symmetric_difference_update(otherset, (PyObject *)so);
-    if (rv == NULL)
+    if (rv == NULL) {
+        Py_DECREF(otherset);
         return NULL;
+    }
     Py_DECREF(rv);
     return (PyObject *)otherset;
 }