tree 6458ebd741af6112cdfda39030edba9a9637e587
parent f85eda8d75d37a3796cee7f5a906e50e3f13d9e1
author Asias He <asias@redhat.com> 1364916697 +0800
committer Nicholas Bellinger <nab@linux-iscsi.org> 1364946214 -0700

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>