From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:58674 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752774AbeDKJF5 (ORCPT ); Wed, 11 Apr 2018 05:05:57 -0400 Subject: Patch "vhost: correctly remove wait queue during poll failure" has been added to the 4.9-stable tree To: jasowang@redhat.com, darren.kenny@oracle.com, davem@davemloft.net, gregkh@linuxfoundation.org, mst@redhat.com Cc: , From: Date: Wed, 11 Apr 2018 11:03:56 +0200 Message-ID: <152343743625334@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: This is a note to let you know that I've just added the patch titled vhost: correctly remove wait queue during poll failure to the 4.9-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-correctly-remove-wait-queue-during-poll-failure.patch and it can be found in the queue-4.9 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From foo@baz Wed Apr 11 10:26:56 CEST 2018 From: Jason Wang Date: Tue, 27 Mar 2018 20:50:52 +0800 Subject: vhost: correctly remove wait queue during poll failure From: Jason Wang [ 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 Reported-by: syzbot+c0272972b01b872e604a@syzkaller.appspotmail.com Fixes: 2b8b328b61c79 ("vhost_net: handle polling errors when setting backend") Signed-off-by: Jason Wang Reviewed-by: Darren Kenny Acked-by: Michael S. Tsirkin Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- drivers/vhost/vhost.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) --- a/drivers/vhost/vhost.c +++ b/drivers/vhost/vhost.c @@ -211,8 +211,7 @@ int vhost_poll_start(struct vhost_poll * 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; } Patches currently in stable-queue which might be from jasowang@redhat.com are queue-4.9/skbuff-return-emsgsize-in-skb_to_sgvec-to-prevent-overflow.patch queue-4.9/virtio_net-check-return-value-of-skb_to_sgvec-always.patch queue-4.9/vhost-validate-log-when-iotlb-is-enabled.patch queue-4.9/vhost_net-add-missing-lock-nesting-notation.patch queue-4.9/vhost-correctly-remove-wait-queue-during-poll-failure.patch queue-4.9/virtio_net-check-return-value-of-skb_to_sgvec-in-one-more-location.patch