[issue27473] bytes_concat seems to check overflow using undefined behaviour

[Roundup Robot]

Roundup Robot added the comment:

New changeset dac248056b20 by Serhiy Storchaka in branch '3.5':
Issue #27473: Fixed possible integer overflow in bytes and bytearray
https://hg.python.org/cpython/rev/dac248056b20

New changeset de8f0e9196d8 by Serhiy Storchaka in branch 'default':
Issue #27473: Fixed possible integer overflow in bytes and bytearray
https://hg.python.org/cpython/rev/de8f0e9196d8

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nosy: +python-dev

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<http://bugs.python.org/issue27473>
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