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[3.13] gh-120298: Fix use-after-free in list_richcompare_impl (GH-120303) (#120340)

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gh-120298: Fix use-after-free in `list_richcompare_impl` (GH-120303)
(cherry picked from commit 141babad9b)

Co-authored-by: Nikita Sobolev <mail@sobolevn.me>
Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
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Miss Islington (bot) 2024-06-11 09:28:45 +02:00 • committed by GitHub
parent 81eae21733
commit 52225c64f7
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3 changed files with 21 additions and 1 deletions
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9
Objects/listobject.c
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@ -3382,7 +3382,14 @@ list_richcompare_impl(PyObject *v, PyObject *w, int op)
}
/* Compare the final item again using the proper operator */
return PyObject_RichCompare(vl->ob_item[i], wl->ob_item[i], op);
PyObject *vitem = vl->ob_item[i];
PyObject *witem = wl->ob_item[i];
Py_INCREF(vitem);
Py_INCREF(witem);
PyObject *result = PyObject_RichCompare(vl->ob_item[i], wl->ob_item[i], op);
Py_DECREF(vitem);
Py_DECREF(witem);
return result;
}
static PyObject *