From: Jason Wang jasowang@redhat.com
This patch has been added to the 4.1 stable tree. If you have any objections, please let us know.
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[ 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: Sasha Levin alexander.levin@microsoft.com --- drivers/vhost/net.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c index 7d137a43cc86..14265c4c0203 100644 --- a/drivers/vhost/net.c +++ b/drivers/vhost/net.c @@ -982,6 +982,7 @@ 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, memory); vhost_net_vq_reset(n); done: