[issue38588] Use-after-free in dict/list

[Inada Naoki]

Inada Naoki <songofacandy at gmail.com> added the comment:

>> This makes list comparison 2x slower.
>
> This is affected by PR 17734? or PyObject_RichCompare patched?

Caused by PR 17734.


> Would you like to revert PR 17734? Calling Py_INCREF and Py_DECREF in PyObject_RichCompare or do_richcompare will take the same effect, no?

Moving INCREF and DECREF is a huge change.  It is just a future idea to prevent same type of bugs.  I think it can not be backported.

To fix this issue with minimum performance regression, I think PR 17766 is the best solution.  So no need to revert PR 17734.

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