linux-kernel - Re: [PATCH net] vhost-vsock: fix use after free

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Message-ID: <a05604fb-74c7-5a6b-2af1-702da68ffbec@redhat.com>
Date:   Thu, 27 Sep 2018 20:21:37 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
        stefanha@...hat.com, mst@...hat.com
Cc:     kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] vhost-vsock: fix use after free



On 2018年09月27日 17:52, Sergei Shtylyov wrote:
> Hello!
>
> On 9/27/2018 11:43 AM, Jason Wang wrote:
>
>    Just a couple of typos...
>
>> The access of vsock is not protected by vhost_vsock_lock. This may
>> lead use after free since vhost_vsock_dev_release() may free the
>
>   Lead to use.
>
>> pointer at the same time.
>>
>> Fix this by holding the lock during the acess.
>
>    Access.
>
>> Reported-by: syzbot+e3e074963495f92a89ed@...kaller.appspotmail.com
>> Fixes: 16320f363ae1 ("vhost-vsock: add pkt cancel capability")
>> Fixes: 433fc58e6bf2 ("VSOCK: Introduce vhost_vsock.ko")
>> Cc: Stefan Hajnoczi <stefanha@...hat.com>
>> Signed-off-by: Jason Wang <jasowang@...hat.com>
> [...]
>
> MBR, Sergei

Let me post V2.

Thanks