From c96a61e8163c2d25ed4ac77cf96201fd0bdb945c Mon Sep 17 00:00:00 2001
From: Victor Stinner <vstinner@python.org>
Date: Mon, 8 Jun 2020 01:39:47 +0200
Subject: [PATCH] bpo-40881: Fix unicode_release_interned() (GH-20699)

Use Py_SET_REFCNT() in unicode_release_interned().
---
 Objects/unicodeobject.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Objects/unicodeobject.c b/Objects/unicodeobject.c
index e69bf01251c..df10888949a 100644
--- a/Objects/unicodeobject.c
+++ b/Objects/unicodeobject.c
@@ -15669,13 +15669,13 @@ unicode_release_interned(void)
         }
         switch (PyUnicode_CHECK_INTERNED(s)) {
         case SSTATE_INTERNED_IMMORTAL:
-            Py_REFCNT(s) += 1;
+            Py_SET_REFCNT(s, Py_REFCNT(s) + 1);
 #ifdef INTERNED_STATS
             immortal_size += PyUnicode_GET_LENGTH(s);
 #endif
             break;
         case SSTATE_INTERNED_MORTAL:
-            Py_REFCNT(s) += 2;
+            Py_SET_REFCNT(s, Py_REFCNT(s) + 2);
 #ifdef INTERNED_STATS
             mortal_size += PyUnicode_GET_LENGTH(s);
 #endif