From 4c596d54aa6a55e9d2a3db78891e656ebbfb63c8 Mon Sep 17 00:00:00 2001
From: Zackery Spytz <zspytz@gmail.com>
Date: Wed, 14 Nov 2018 15:39:01 -0700
Subject: [PATCH] Fix a possible reference leak in _socket.getaddrinfo().
 (GH-10543)

"single" needs to be decrefed if PyList_Append() fails.
---
 Modules/socketmodule.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/Modules/socketmodule.c b/Modules/socketmodule.c
index 9149641fce5..a47f0314605 100644
--- a/Modules/socketmodule.c
+++ b/Modules/socketmodule.c
@@ -6370,9 +6370,11 @@ socket_getaddrinfo(PyObject *self, PyObject *args, PyObject* kwargs)
         if (single == NULL)
             goto err;
 
-        if (PyList_Append(all, single))
+        if (PyList_Append(all, single)) {
+            Py_DECREF(single);
             goto err;
-        Py_XDECREF(single);
+        }
+        Py_DECREF(single);
     }
     Py_XDECREF(idna);
     if (res0)