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

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

Signed-off-by: Venkatesh Srinivas <venkateshs@google.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/vhost/scsi.c b/drivers/vhost/scsi.c
index 0a025b8e2a12..e48d4a672580 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]);