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

diff --git a/Python/symtable.c b/Python/symtable.c
index 18ea57690b5dea7d62482dc59de29fa095fd53ae..2795e0f1115b8df9cd3344f88c560d310c2ee7d8 100644 (file)
--- 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