[issue16743] mmap accepts files > 1 GB, but processes only 1 GB

[Richard Oudkerk]

Richard Oudkerk added the comment:

This bit looks wrong to me:

            if (offset - size > PY_SSIZE_T_MAX)
                /* Map area too large to fit in memory */
                m_obj->size = (Py_ssize_t) -1;

Should it not be "size - offset" instead of "offset - size"?  (offset and size are Py_LONG_LONG.)  And there is no check that offset is non-negative.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue16743>
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