File bpo-29347-dereferencing-undefined-pointers.patch of Package python.11987

From 7131a73f9655cfd325c798385905326f57b94640 Mon Sep 17 00:00:00 2001
From: Xiang Zhang <angwerzx@126.com>
Date: Mon, 20 Feb 2017 14:32:53 +0800
Subject: [PATCH] bpo-29347: Fix possibly dereferencing undefined pointers when
 creating weakref objects (#128) (#187)

---
 Misc/NEWS               | 3 +++
 Objects/weakrefobject.c | 2 ++
 2 files changed, 5 insertions(+)

--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -80,6 +80,9 @@ Core and Builtins
 - Issue #27514: Make having too many statically nested blocks a SyntaxError
   instead of SystemError.
 
+- bpo-29347: Fixed possibly dereferencing undefined pointers
+  when creating weakref objects.
+
 Library
 -------
 
--- a/Objects/weakrefobject.c
+++ b/Objects/weakrefobject.c
@@ -24,6 +24,8 @@ init_weakref(PyWeakReference *self, PyOb
 {
     self->hash = -1;
     self->wr_object = ob;
+    self->wr_prev = NULL;
+    self->wr_next = NULL;
     Py_XINCREF(callback);
     self->wr_callback = callback;
 }