python
diff --git a/‎Misc/NEWS
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+3Lines changed: 3 additions & 0 deletions b/‎Misc/NEWS
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diff --git a/‎Objects/weakrefobject.c
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+2Lines changed: 2 additions & 0 deletions b/‎Objects/weakrefobject.c
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+2Lines changed: 2 additions & 0 deletions
@@ -10,6 +10,9 @@ What's New in Python 3.7.0 alpha 1?
 Core and Builtins
 -----------------
 
+- bpo-29347: Fixed possibly dereferencing undefined pointers
+  when creating weakref objects.
+
 - bpo-29438: Fixed use-after-free problem in key sharing dict.
 
 - bpo-29546: Set the 'path' and 'name' attribute on ImportError for ``from ... import ...``.
 
@@ -24,6 +24,8 @@ init_weakref(PyWeakReference *self, PyObject *ob, PyObject *callback)
 {
     self->hash = -1;
     self->wr_object = ob;
+    self->wr_prev = NULL;
+    self->wr_next = NULL;
     Py_XINCREF(callback);
     self->wr_callback = callback;
 }
Original file line number	Diff line number	Diff line change
`@@ -24,6 +24,8 @@ init_weakref(PyWeakReference self, PyObject ob, PyObject *callback)`
`24`	`24`	`{`
`25`	`25`	`self->hash = -1;`
`26`	`26`	`self->wr_object = ob;`
	`27`	`+ self->wr_prev = NULL;`
	`28`	`+ self->wr_next = NULL;`
`27`	`29`	`Py_XINCREF(callback);`
`28`	`30`	`self->wr_callback = callback;`
`29`	`31`	`}`