4.15-stable review patch.  If anyone has any objections, please let me know.


From: Jason Wang <jasow...@redhat.com>

[ Upstream commit 4cd879515d686849eec5f718aeac62a70b067d82 ]

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+eb17c6162478cc506...@syzkaller.appspotmail.com
Fixes: 3a4d5c94e9593 ("vhost_net: a kernel-level virtio server")
Signed-off-by: Jason Wang <jasow...@redhat.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
 drivers/vhost/net.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/vhost/net.c
+++ b/drivers/vhost/net.c
@@ -1208,6 +1208,7 @@ static long vhost_net_reset_owner(struct
        vhost_net_stop(n, &tx_sock, &rx_sock);
+       vhost_dev_stop(&n->dev);
        vhost_dev_reset_owner(&n->dev, umem);

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