From: Benjamin Peterson <benjamin@python.org>
Date: Tue, 30 Sep 2014 02:46:57 +0000 (-0400)
Subject: clear BufferedRWPair weakrefs on deallocation (closes #22517)
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=1c873bf77d855e821d7c1b4d9a2489b2a1b85f5f;p=python

clear BufferedRWPair weakrefs on deallocation (closes #22517)
---

diff --git a/Lib/test/test_io.py b/Lib/test/test_io.py
index af3b90ab80..2a3b4a3b14 100644
--- a/Lib/test/test_io.py
+++ b/Lib/test/test_io.py
@@ -1474,6 +1474,12 @@ class BufferedRWPairTest(unittest.TestCase):
         pair = self.tp(SelectableIsAtty(True), SelectableIsAtty(True))
         self.assertTrue(pair.isatty())
 
+    def test_weakref_clearing(self):
+        brw = self.tp(self.MockRawIO(), self.MockRawIO())
+        ref = weakref.ref(brw)
+        brw = None
+        ref = None # Shouldn't segfault.
+
 class CBufferedRWPairTest(BufferedRWPairTest):
     tp = io.BufferedRWPair
 
diff --git a/Misc/NEWS b/Misc/NEWS
index 47de844425..888abf5a10 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -29,6 +29,9 @@ Core and Builtins
 Library
 -------
 
+- Issue #22517: When a io.BufferedRWPair object is deallocated, clear its
+  weakrefs.
+
 - Issue #10510: distutils register and upload methods now use HTML standards
   compliant CRLF line endings.
 
diff --git a/Modules/_io/bufferedio.c b/Modules/_io/bufferedio.c
index 758edf4208..62a350b691 100644
--- a/Modules/_io/bufferedio.c
+++ b/Modules/_io/bufferedio.c
@@ -2120,6 +2120,8 @@ static void
 bufferedrwpair_dealloc(rwpair *self)
 {
     _PyObject_GC_UNTRACK(self);
+    if (self->weakreflist != NULL)
+        PyObject_ClearWeakRefs((PyObject *)self);
     Py_CLEAR(self->reader);
     Py_CLEAR(self->writer);
     Py_CLEAR(self->dict);