
scsi_disk_emulate_command passes in_buf == NULL when sent a REQUEST SENSE command. Check for in_len == 0 before dereferencing in_buf. Fixes: f68d98b21fa74155dc7c1fd212474379ac3c7531 Reported-by: Roman Kagan <rkagan@virtuozzo.com> Tested-by: Roman Kagan <rkagan@virtuozzo.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>