netdev - Re: [Patch net v2] ipv6: fix a potential deadlock in do_ipv6

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Message-ID: <CAM_iQpUvU8dZPquAgtcZASO6jhjtoYQ2nc8EBceqZmSHg4ZSsQ@mail.gmail.com>
Date:   Thu, 20 Oct 2016 14:35:59 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>,
        Baozeng Ding <sploving1@...il.com>,
        Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
Subject: Re: [Patch net v2] ipv6: fix a potential deadlock in do_ipv6_setsockopt()

On Thu, Oct 20, 2016 at 6:47 AM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> On Wed, 2016-10-19 at 23:35 -0700, Cong Wang wrote:
>> Baozeng reported this deadlock case:
>
> ...
>
>> +
>> +void ipv6_sock_mc_close(struct sock *sk)
>> +{
>> +     struct ipv6_pinfo *np = inet6_sk(sk);
>> +
>> +     if (!rcu_access_pointer(np->ipv6_mc_list))
>> +             return;
>
> I wonder if rcu_dereference_protected(..., lockdep_sock_is_held(sk))
> could be used instead, to get lockdep support ?

Maybe, but this "problem" exists without my patch too, right?