From: Jason Wang <jasowang@redhat.com>
To: mst@redhat.com, jasowang@redhat.com
Cc: kvm@vger.kernel.org, virtualization@lists.linux-foundation.org,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
Darren Kenny <darren.kenny@oracle.com>
Subject: [PATCH net V2] vhost: correctly remove wait queue during poll failure
Date: Tue, 27 Mar 2018 20:50:52 +0800 [thread overview]
Message-ID: <1522155052-13347-1-git-send-email-jasowang@redhat.com> (raw)
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>
---
Changes from V1:
- tweak the commit log for to match the code
---
drivers/vhost/vhost.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index 1b3e8d2d..5d5a9d9 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -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;
}
--
2.7.4
next reply other threads:[~2018-03-27 12:51 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-27 12:50 Jason Wang [this message]
2018-03-27 13:07 ` [PATCH net V2] vhost: correctly remove wait queue during poll failure Darren Kenny
2018-03-27 13:59 ` Michael S. Tsirkin
2018-03-27 17:04 ` David Miller
2018-03-29 4:20 ` Michael S. Tsirkin
2018-03-29 8:01 ` Jason Wang
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