Amaury Forgeot d'Arc <amaur...@gmail.com> added the comment:

All expressions are of type Py_ssize_t, which is signed.
buffer_len is positive; the subtraction (buffer_len - offset) can 
overflow only if offset is a (large) negative number, but then the first 
part of the test is already fulfilled.

Closing unless more evidence is given.

----------
resolution:  -> works for me
status: open -> closed

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue2590>
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