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f731ed6293
Although most paths through which a request is submitted check block layer parameters like the max_segments limit, these are not checked when an SG_IO or direct I/O request is submitted. Hence add a range check for the memory descriptor array pointer. Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com> Signed-off-by: Doug Ledford <dledford@redhat.com>