4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Jason Wang jasowang@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+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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/vhost/net.c | 1 + 1 file changed, 1 insertion(+)
--- a/drivers/vhost/net.c +++ b/drivers/vhost/net.c @@ -1078,6 +1078,7 @@ static long vhost_net_reset_owner(struct } 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: