From fc439d20de32b0ebccca79a96e31f83b85ec4eaf Mon Sep 17 00:00:00 2001
From: Zackery Spytz <zspytz@gmail.com>
Date: Wed, 10 Oct 2018 23:05:35 -0600
Subject: [PATCH] Fix a possible decref of a borrowed reference in symtable.c.
 (GH-9786)

---
 Python/symtable.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/Python/symtable.c b/Python/symtable.c
index 16b706b3633..d74f26fbe35 100644
--- a/Python/symtable.c
+++ b/Python/symtable.c
@@ -625,8 +625,10 @@ update_symbols(PyObject *symbols, PyObject *scopes,
         return 0;
 
     itr = PyObject_GetIter(free);
-    if (!itr)
-        goto error;
+    if (itr == NULL) {
+        Py_DECREF(v_free);
+        return 0;
+    }
 
     while ((name = PyIter_Next(itr))) {
         v = PyDict_GetItem(symbols, name);