Comment 2 for bug 623840

And fixing the munmap() being missing in read_from_spool_and_send_to_xen() reveals that xen_write_path->xs_write also stores 'buf'.. When you munmap() buf... The stored 'buf' in mock_xenstore points to bogus space.

So, obj->buf = buf; also needs to be fixed to malloc memory and memcpy.