8000 Issue #22517: When a io.BufferedRWPair object is deallocated, clear its · python/cpython@21bf3f9 · GitHub
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Issue #22517: When a io.BufferedRWPair object is deallocated, clear its
weakrefs.
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Lib/test/test_io.py

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@@ -1454,6 +1454,12 @@ def isatty(self):
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pair = self.tp(SelectableIsAtty(True), SelectableIsAtty(True))
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self.assertTrue(pair.isatty())
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def test_weakref_clearing(self):
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brw = self.tp(self.MockRawIO(), self.MockRawIO())
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ref = weakref.ref(brw)
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brw = None
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ref = None # Shouldn't segfault.
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class CBufferedRWPairTest(BufferedRWPairTest):
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tp = io.BufferedRWPair
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Misc/NEWS

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@@ -10,6 +10,9 @@ What's New in Python 3.2.6?
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Library
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-------
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- Issue #22517: When a io.BufferedRWPair object is deallocated, clear its
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weakrefs.
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- Issue #16041: CVE-2013-1752: poplib: Limit maximum line lengths to 2048 to
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prevent readline() calls from consuming too much memory. Patch by Jyrki
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Pulliainen.

Modules/_io/bufferedio.c

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@@ -2141,6 +2141,8 @@ static void
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bufferedrwpair_dealloc(rwpair *self)
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{
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_PyObject_GC_UNTRACK(self);
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if (self->weakreflist != NULL)
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PyObject_ClearWeakRefs((PyObject *)self);
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Py_CLEAR(self->reader);
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Py_CLEAR(self->writer);
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Py_CLEAR(self->dict);

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