diff options
| author | Jason Wang <jasowang@redhat.com> | 2018-03-27 15:50:52 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-04-12 13:31:17 +0300 |
| commit | 25d45c0fd16c75389ba208c0d2569dc607155f32 (patch) | |
| tree | 261730e5fec634ec900083effb7fe8a2542e3bdc | |
| parent | 3407271beb995f4ae800c7ca28878f0619e7043b (diff) | |
| download | linux-25d45c0fd16c75389ba208c0d2569dc607155f32.tar.xz | |
vhost: correctly remove wait queue during poll failure
[ Upstream commit dc6455a71c7fc5117977e197f67f71b49f27baba ]
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: 2b8b328b61c79 ("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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/vhost/vhost.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c index 5727b186b3ca..f42683578dca 100644 --- a/drivers/vhost/vhost.c +++ b/drivers/vhost/vhost.c @@ -213,8 +213,7 @@ int vhost_poll_start(struct vhost_poll *poll, struct file *file) if (mask) vhost_poll_wakeup(&poll->wait, 0, 0, (void *)mask); if (mask & POLLERR) { - if (poll->wqh) - remove_wait_queue(poll->wqh, &poll->wait); + vhost_poll_stop(poll); ret = -EINVAL; } |