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

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Date:   Thu, 20 Oct 2016 06:47:06 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Cong Wang <xiyou.wangcong@...il.com>
Cc:     netdev@...r.kernel.org, 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 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 ?

> +	rtnl_lock();
> +	__ipv6_sock_mc_close(sk);
>  	rtnl_unlock();
>  }
>  

Thanks !