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gh-126405: fix use-after-free in _asyncio.Future.remove_done_callback (#126733)

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Kumar Aditya 2024-11-12 18:01:34 +05:30 committed by GitHub
parent 0ef84b0e2b
commit 37c57dfad1
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Modules/_asynciomodule.c
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@ -1017,8 +1017,10 @@ _asyncio_Future_remove_done_callback_impl(FutureObj *self, PyTypeObject *cls,
if (len == 1) { if (len == 1) {
PyObject *cb_tup = PyList_GET_ITEM(self->fut_callbacks, 0); PyObject *cb_tup = PyList_GET_ITEM(self->fut_callbacks, 0);
Py_INCREF(cb_tup);
int cmp = PyObject_RichCompareBool( int cmp = PyObject_RichCompareBool(
PyTuple_GET_ITEM(cb_tup, 0), fn, Py_EQ); PyTuple_GET_ITEM(cb_tup, 0), fn, Py_EQ);
Py_DECREF(cb_tup);
if (cmp == -1) { if (cmp == -1) {
return NULL; return NULL;
} }