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(parent: 3b076cf) | patch
vhost: make sure used idx is seen before log in vhost_add_used_n()
authorJason Wang <jasowang@redhat.com>
Thu, 13 Dec 2018 02:53:37 +0000 (10:53 +0800)
committerDavid S. Miller <davem@davemloft.net>
Thu, 13 Dec 2018 05:56:19 +0000 (21:56 -0800)
commit841df922417eb82c835e93d4b93eb6a68c99d599
tree0286f8784c5eafeda7b38db9cc989780b34387cftree | snapshot
parent3b076cfe86be3784dee93cfd83d6913a9ef530eecommit | diff
vhost: make sure used idx is seen before log in vhost_add_used_n()

We miss a write barrier that guarantees used idx is updated and seen
before log. This will let userspace sync and copy used ring before
used idx is update. Fix this by adding a barrier before log_write().

Fixes: 8dd014adfea6f ("vhost-net: mergeable buffers support")
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
drivers/vhost/vhost.c diff | blob | history
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