Patch "vhost_net: stop device during reset owner" has been added to the 3.18-stable tree

Patch "vhost_net: stop device during reset owner" has been added to the 3.18-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    vhost_net: stop device during reset owner

to the 3.18-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     vhost_net-stop-device-during-reset-owner.patch
and it can be found in the queue-3.18 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Wed Feb  7 11:22:35 PST 2018
From: Jason Wang <jasowang@redhat.com>
Date: Thu, 25 Jan 2018 22:03:52 +0800
Subject: vhost_net: stop device during reset owner

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
@@ -1009,6 +1009,7 @@ 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, memory);
 	vhost_net_vq_reset(n);
 done:


Patches currently in stable-queue which might be from jasowang@redhat.com are

queue-3.18/vhost_net-stop-device-during-reset-owner.patch