[issue27056] pickle: constant propagation in _Unpickler_Read()

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

I think that integer overflow in _Unpickler_Read() is possible. n is read from file and can be arbitrary (up to PY_SSIZE_T_MAX). This likely cause raising an exception later, but integer overflow itself causes undefined behavior, and we should avoid it.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue27056>
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