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vhost: correctly remove wait queue during poll failure 

We tried to remove vq poll from wait queue, but do not check whether
or not it was in a list before. This will lead double free. Fixing
this by switching to use vhost_poll_stop() which zeros poll->wqh after
removing poll from waitqueue to make sure it won't be freed twice.

Cc: Darren Kenny <darren.kenny@oracle.com>
Reported-by: syzbot+c0272972b01b872e604a@syzkaller.appspotmail.com
Fixes: 2b8b328b61 ("vhost_net: handle polling errors when setting backend")
Signed-off-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Darren Kenny <darren.kenny@oracle.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jason Wang 2018-03-27 20:50:52 +08:00 committed by David S. Miller
parent d222a08432
commit dc6455a71c
1 changed files with 1 additions and 2 deletions
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3
drivers/vhost/vhost.c
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@ -212,8 +212,7 @@ int vhost_poll_start(struct vhost_poll *poll, struct file *file)
if (mask)
vhost_poll_wakeup(&poll->wait, 0, 0, poll_to_key(mask));
if (mask & EPOLLERR) {
if (poll->wqh)
remove_wait_queue(poll->wqh, &poll->wait);
vhost_poll_stop(poll);
ret = -EINVAL;
}