netdev - Re: [Patch net v3] tun: fix a memory leak for tfile->tx

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Message-ID: <CAM_iQpVCUjOSr+_fvJ=zg=sBYbPaAaYRsXXJZQfCxGyxtVcRLA@mail.gmail.com>
Date:   Mon, 15 Jan 2018 22:33:40 -0800
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Jason Wang <jasowang@...hat.com>
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>,
        Dmitry Vyukov <dvyukov@...gle.com>
Subject: Re: [Patch net v3] tun: fix a memory leak for tfile->tx_array

On Mon, Jan 15, 2018 at 10:12 PM, Jason Wang <jasowang@...hat.com> wrote:
>
>
> On 2018年01月16日 14:07, Cong Wang wrote:
>>
>> On Mon, Jan 15, 2018 at 10:00 PM, Jason Wang <jasowang@...hat.com> wrote:
>>>
>>> I mean we can leave __tun_detach() as is, and just add the cleanup to
>>> tun_detach_all(). This is because in both cases, we're sure skb array has
>>> been initialized before.
>>>
>> Oh, I thought the same before sending v3, but I believe it is easier to
>> understand 'if (tfile->tx_array.ring.queue)' than 'if (tun)', because
>> tx_array
>> only depends on itself rather tfile->tun in this way.
>
>
> Maybe just add a comment to explain in __tun_detach(), it avoids memset()
> anyway.
>

But __tun_detach(true) is not a hot path, a memset() doesn't harm anything.