vhost_net: stop device during reset owner

We don't stop device before reset owner, this means we could try to
serve any virtqueue kick before reset dev->worker. This will result a
warn since the work was pending at llist during owner resetting. Fix
this by stopping device during owner reset.

Reported-by: syzbot+eb17c6162478cc50632c@syzkaller.appspotmail.com
Fixes: 3a4d5c94e9593 ("vhost_net: a kernel-level virtio server")
Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
index 7baa90a..8032394 100644 (file)
--- a/drivers/vhost/net.c
+++ b/drivers/vhost/net.c
@@ -1227,6 +1227,7 @@ static long vhost_net_reset_owner(struct vhost_net *n)
        }
        vhost_net_stop(n, &tx_sock, &rx_sock);
        vhost_net_flush(n);
+       vhost_dev_stop(&n->dev);
        vhost_dev_reset_owner(&n->dev, umem);
        vhost_net_vq_reset(n);
 done: