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@xxxxxxxxxx>
---
drivers/vhost/tcm_vhost.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/vhost/tcm_vhost.c b/drivers/vhost/tcm_vhost.c
index 0524267..32d95e3 100644
--- a/drivers/vhost/tcm_vhost.c
+++ b/drivers/vhost/tcm_vhost.c
@@ -668,7 +668,7 @@ 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)) {
--
1.8.1.4
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