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linux/drivers/vhost/vhost.c
Jason Wang 9b99c4b916 vhost: make sure used idx is seen before log in vhost_add_used_n() 
commit 841df92241 upstream.

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: 8dd014adfe ("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>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
2019-02-11 17:54:25 +00:00

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