netdev - Re: [PATCH net V2] vhost: correctly remove wait queue during poll failure

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Date:   Thu, 29 Mar 2018 16:01:44 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Darren Kenny <darren.kenny@...cle.com>
Subject: Re: [PATCH net V2] vhost: correctly remove wait queue during poll
 failure



On 2018年03月29日 12:20, Michael S. Tsirkin wrote:
> On Tue, Mar 27, 2018 at 08:50:52PM +0800, Jason Wang wrote:
>> 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@...cle.com>
>> Reported-by:syzbot+c0272972b01b872e604a@...kaller.appspotmail.com
>> Fixes: 2b8b328b61c79 ("vhost_net: handle polling errors when setting backend")
>> Signed-off-by: Jason Wang<jasowang@...hat.com>
> OK with this the only bug we have is where get user pages returns 0
> (Reported-by:syzbot+6304bf97ef436580fede@...kaller.appspotmail.com)
>
>
>

Thanks for the reminder.

I post a patch to avoid this.