netdev - Re: [PATCH nf-next 2/6] netfilter: bridge: check len before accessing more nh data

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Message-ID: <583cc2c7-7883-57fe-6b48-25e5e43c3ec0@blackwall.org>
Date:   Tue, 7 Mar 2023 11:20:03 +0200
From:   Nikolay Aleksandrov <razor@...ckwall.org>
To:     Xin Long <lucien.xin@...il.com>, netfilter-devel@...r.kernel.org,
        network dev <netdev@...r.kernel.org>
Cc:     Pablo Neira Ayuso <pablo@...filter.org>,
        Jozsef Kadlecsik <kadlec@...filter.org>,
        Florian Westphal <fw@...len.de>, davem@...emloft.net,
        kuba@...nel.org, Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Roopa Prabhu <roopa@...dia.com>,
        Pravin B Shelar <pshelar@....org>,
        Aaron Conole <aconole@...hat.com>
Subject: Re: [PATCH nf-next 2/6] netfilter: bridge: check len before accessing
 more nh data

On 04/03/2023 02:12, Xin Long wrote:
> In the while loop of br_nf_check_hbh_len(), similar to ip6_parse_tlv(),
> before accessing 'nh[off + 1]', it should add a check 'len < 2'; and
> before parsing IPV6_TLV_JUMBO, it should add a check 'optlen > len',
> in case of overflows.
> 
> Signed-off-by: Xin Long <lucien.xin@...il.com>
> ---
>  net/bridge/br_netfilter_ipv6.c | 47 ++++++++++++++++------------------
>  1 file changed, 22 insertions(+), 25 deletions(-)


Acked-by: Nikolay Aleksandrov <razor@...ckwall.org>