netdev - Re: [PATCH net] net: sched: fix NULL pointer dereference when action calls some targets

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Message-ID: <CADvbK_cCQY0McHiZFKSTjdGdAjhB6RBej5n=SH2=hsLYC=Xa7w@mail.gmail.com>
Date:   Wed, 16 Aug 2017 20:39:44 +1200
From:   Xin Long <lucien.xin@...il.com>
To:     Cong Wang <xiyou.wangcong@...il.com>
Cc:     network dev <netdev@...r.kernel.org>,
        David Miller <davem@...emloft.net>,
        netfilter-devel@...r.kernel.org,
        Jamal Hadi Salim <jhs@...atatu.com>
Subject: Re: [PATCH net] net: sched: fix NULL pointer dereference when action
 calls some targets

On Wed, Aug 9, 2017 at 7:33 AM, Cong Wang <xiyou.wangcong@...il.com> wrote:
> On Mon, Aug 7, 2017 at 7:33 PM, Xin Long <lucien.xin@...il.com> wrote:
>> On Tue, Aug 8, 2017 at 9:15 AM, Cong Wang <xiyou.wangcong@...il.com> wrote:
>>> This looks like a completely API burden?
>> netfilter xt targets are not really compatible with netsched action.
>> I've got to say, the patch is just a way to make checkentry return
>> false and avoid panic. like [1] said
>
> I don't doubt you fix a crash, I am thinking if we can
> "fix" the API instead of fixing the caller.
Hi, Cong,

For now, I don't think it's possible to change APIs or  some of their targets
for the panic caused by action xt calling.

The common way should be fixed in net_sched side.

Given that the issue is very easy to triggered,
let's wait for netfilter's replies for another few days,
otherwise I will repost the fix, agree ?

>
> I am not familiar with this API, so just my 2 cents...