linux-kernel - Re: [PATCH nf] netfilter: ensure rcu_read_lock() in ipv4_find

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Message-ID: <20200224191154.GH19559@breakpoint.cc>
Date:   Mon, 24 Feb 2020 20:11:54 +0100
From:   Florian Westphal <fw@...len.de>
To:     Matteo Croce <mcroce@...hat.com>
Cc:     netfilter-devel@...r.kernel.org, coreteam@...filter.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Pablo Neira Ayuso <pablo@...filter.org>,
        Jozsef Kadlecsik <kadlec@...filter.org>,
        Florian Westphal <fw@...len.de>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Stephen Suryaputra <ssuryaextr@...il.com>
Subject: Re: [PATCH nf] netfilter: ensure rcu_read_lock() in
 ipv4_find_option()

Matteo Croce <mcroce@...hat.com> wrote:
> As in commit c543cb4a5f07 ("ipv4: ensure rcu_read_lock() in ipv4_link_failure()")
> and commit 3e72dfdf8227 ("ipv4: ensure rcu_read_lock() in cipso_v4_error()"),
> __ip_options_compile() must be called under rcu protection.

This is not needed, all netfilter hooks run with rcu_read_lock held.