linux-kernel - Re: [PATCH NETFILTER v2] netfilter: nfnetlink: suspicious RCU usage in ctnetlink_dump

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Message-ID: <20210702005422.GA29227@salvia>
Date:   Fri, 2 Jul 2021 02:54:22 +0200
From:   Pablo Neira Ayuso <pablo@...filter.org>
To:     Vasily Averin <vvs@...tuozzo.com>
Cc:     Jozsef Kadlecsik <kadlec@...filter.org>,
        Florian Westphal <fw@...len.de>,
        Taehee Yoo <ap420073@...il.com>, Julian Anastasov <ja@....bg>,
        netfilter-devel@...r.kernel.org, coreteam@...filter.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH NETFILTER v2] netfilter: nfnetlink: suspicious RCU usage
 in ctnetlink_dump_helpinfo

On Thu, Jul 01, 2021 at 08:02:49AM +0300, Vasily Averin wrote:
> Two patches listed below removed ctnetlink_dump_helpinfo call from under
> rcu_read_lock. Now its rcu_dereference generates following warning:
> =============================
> WARNING: suspicious RCU usage
> 5.13.0+ #5 Not tainted
> -----------------------------
> net/netfilter/nf_conntrack_netlink.c:221 suspicious rcu_dereference_check() usage!

Applied.