From a6296d34a478b4f697ea9db798146195075d496c Mon Sep 17 00:00:00 2001
From: INADA Naoki <methane@users.noreply.github.com>
Date: Thu, 24 Aug 2017 14:55:17 +0900
Subject: bpo-31095: fix potential crash during GC (GH-2974)

---
 Modules/_struct.c | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'Modules/_struct.c')

diff --git a/Modules/_struct.c b/Modules/_struct.c
index b5fbc43564..69a1e996d0 100644
--- a/Modules/_struct.c
+++ b/Modules/_struct.c
@@ -1589,6 +1589,8 @@ typedef struct {
 static void
 unpackiter_dealloc(unpackiterobject *self)
 {
+    /* bpo-31095: UnTrack is needed before calling any callbacks */
+    PyObject_GC_UnTrack(self);
     Py_XDECREF(self->so);
     PyBuffer_Release(&self->buf);
     PyObject_GC_Del(self);
-- 
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