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tcm_vhost: Use ACCESS_ONCE for vs->vs_tpg[target] access 

In vhost_scsi_handle_vq:

      tv_tpg = vs->vs_tpg[target];
      if (!tv_tpg) {
              ....
              return
      }

      tv_cmd = vhost_scsi_allocate_cmd(tv_tpg, &v_req,

1) vs->vs_tpg[target] might change after the NULL check and 2) the above
line might access tv_tpg from vs->vs_tpg[target]. To prevent 2), use
ACCESS_ONCE. Thanks mst for catching this up!

Signed-off-by: Asias He <asias@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Asias He 2013-04-02 23:31:37 +08:00 committed by Nicholas Bellinger
parent f85eda8d75
commit af0d9187f6
1 changed files with 1 additions and 1 deletions
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2
drivers/vhost/tcm_vhost.c
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@ -661,7 +661,7 @@ static void vhost_scsi_handle_vq(struct vhost_scsi *vs,
/* Extract the tpgt */
target = v_req.lun[1];
tv_tpg = vs->vs_tpg[target];
tv_tpg = ACCESS_ONCE(vs->vs_tpg[target]);
/* Target does not exist, fail the request */
if (unlikely(!tv_tpg)) {