bpo-37954: Fix reference leak in the symtable (GH-15514)

miss-islington · pablogsal · web-flow · commit ed8af33cce55 · 2019-08-26T08:49:44.000-07:00
(cherry picked from commit 4901dc4) Co-authored-by: Pablo Galindo <Pablogsal@gmail.com>
diff --git a/Python/symtable.c b/Python/symtable.c
@@ -999,7 +999,9 @@ symtable_lookup(struct symtable *st, PyObject *name)
     PyObject *mangled = _Py_Mangle(st->st_private, name);
     if (!mangled)
         return 0;
-    return _PyST_GetSymbol(st->st_cur, mangled);
+    long ret = _PyST_GetSymbol(st->st_cur, mangled);
+    Py_DECREF(mangled);
+    return ret;
 }
 
 static int
