From c81609e44eed641d3b8a137daa31ef35501c1f85 Mon Sep 17 00:00:00 2001
From: Hai Shi <shihai1992@gmail.com>
Date: Mon, 16 Mar 2020 03:37:49 +0800
Subject: [PATCH] Fix a possible refleak in tupleobject.c (GH-19018)

---
 Objects/tupleobject.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Objects/tupleobject.c b/Objects/tupleobject.c
index 14ab53fca22..839667ad6f1 100644
--- a/Objects/tupleobject.c
+++ b/Objects/tupleobject.c
@@ -737,8 +737,10 @@ tuple_subtype_new(PyTypeObject *type, PyObject *iterable)
         return NULL;
     assert(PyTuple_Check(tmp));
     newobj = type->tp_alloc(type, n = PyTuple_GET_SIZE(tmp));
-    if (newobj == NULL)
+    if (newobj == NULL) {
+        Py_DECREF(tmp);
         return NULL;
+    }
     for (i = 0; i < n; i++) {
         item = PyTuple_GET_ITEM(tmp, i);
         Py_INCREF(item);