From: Stefan Hajnoczi <stefanha@redhat.com>
To: Jason Wang <jasowang@redhat.com>
Cc: mst@redhat.com, kvm@vger.kernel.org,
virtualization@lists.linux-foundation.org,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
sergei.shtylyov@cogentembedded.com
Subject: Re: [PATCH net V2] vhost-vsock: fix use after free
Date: Thu, 27 Sep 2018 16:33:21 +0100 [thread overview]
Message-ID: <20180927153321.GB10133@stefanha-x1.localdomain> (raw)
In-Reply-To: <20180927122204.4188-1-jasowang@redhat.com>
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On Thu, Sep 27, 2018 at 08:22:04PM +0800, Jason Wang wrote:
> The access of vsock is not protected by vhost_vsock_lock. This may
> lead to use after free since vhost_vsock_dev_release() may free the
> pointer at the same time.
>
> Fix this by holding the lock during the access.
>
> Reported-by: syzbot+e3e074963495f92a89ed@syzkaller.appspotmail.com
> Fixes: 16320f363ae1 ("vhost-vsock: add pkt cancel capability")
> Fixes: 433fc58e6bf2 ("VSOCK: Introduce vhost_vsock.ko")
> Cc: Stefan Hajnoczi <stefanha@redhat.com>
> Signed-off-by: Jason Wang <jasowang@redhat.com>
> ---
> - V2: fix typos
> - The patch is needed for -stable.
> ---
> drivers/vhost/vsock.c | 26 +++++++++++++++++++-------
> 1 file changed, 19 insertions(+), 7 deletions(-)
Thank you, Jason!
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
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next prev parent reply other threads:[~2018-09-27 15:33 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-27 12:22 [PATCH net V2] vhost-vsock: fix use after free Jason Wang
2018-09-27 15:33 ` Stefan Hajnoczi [this message]
2018-09-27 17:04 ` Michael S. Tsirkin
2018-09-27 23:37 ` Jason Wang
2018-09-27 23:50 ` Michael S. Tsirkin
2018-10-08 2:20 ` Jason Wang
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