[PATCH] vhost/scsi: Check LUN structure byte 0 is set to 1, per spec

[Venkatesh Srinivas <venkateshs@google.com>]

The virtio spec requires byte 0 of the virtio-scsi LUN structure
to be '1'.

Signed-off-by: Venkatesh Srinivas <venkateshs@google.com>
---
  drivers/vhost/scsi.c | 6 ++++++
  1 file changed, 6 insertions(+)

diff --git a/drivers/vhost/scsi.c b/drivers/vhost/scsi.c
index 0a025b8..e48d4a6 100644
--- a/drivers/vhost/scsi.c
+++ b/drivers/vhost/scsi.c
@@ -1001,6 +1001,12 @@ vhost_scsi_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq)
  			break;
  		}
  
+		/* virtio-scsi spec requires byte 0 of the lun to be 1 */
+		if (unlikely(v_req.lun[0] != 1)) {
+			vhost_scsi_send_bad_target(vs, vq, head, out);
+			continue;
+		}
+
  		/* Extract the tpgt */
  		target = v_req.lun[1];
  		tpg = ACCESS_ONCE(vs_tpg[target]);
-- 
1.8.5.3