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Issue #16602: When a weakref's target was part of a long deallocation chain, the object could remain reachable through its weakref even though its refcount had dropped to zero.

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Thanks to Eugene Toder for diagnosing and reporting the issue.
This commit is contained in:
Antoine Pitrou 2012-12-08 21:15:26 +01:00
parent bd5279ea24
commit d38c990bb7
5 changed files with 39 additions and 4 deletions
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5
Objects/weakrefobject.c
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@ -52,9 +52,8 @@ clear_weakref(PyWeakReference *self)
{
PyObject *callback = self->wr_callback;
if (PyWeakref_GET_OBJECT(self) != Py_None) {
PyWeakReference **list = GET_WEAKREFS_LISTPTR(
PyWeakref_GET_OBJECT(self));
if (self->wr_object != Py_None) {
PyWeakReference **list = GET_WEAKREFS_LISTPTR(self->wr_object);
if (*list == self)
/* If 'self' is the end of the list (and thus self->wr_next == NULL)