[issue15903] Make rawiobase_read() read directly to bytes object

[Richard Oudkerk]

Richard Oudkerk added the comment:

> Then the view owns a reference to the bytes object. But that does not
> solve the problem that writable memoryviews based on a readonly object
> might be hanging around.

How about doing

    PyObject_GetBuffer(b, &buf, PyBUF_WRITABLE);
    view = PyMemoryView_FromBuffer(&buf);
    // readinto view
    PyBuffer_Release(&buf);

Would attempts to access a "leaked" reference to view now result in ValueError("operation forbidden on released memoryview object")?  If so then I think this would be safe.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue15903>
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