linux-kernel - Re: [PATCH nf] netfilter/xt_sctp: validate the flag

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Message-ID: <ZO9dmIXtmWGlrSDh@calendula>
Date:   Wed, 30 Aug 2023 17:17:44 +0200
From:   Pablo Neira Ayuso <pablo@...filter.org>
To:     Wander Lairson Costa <wander@...hat.com>
Cc:     Jozsef Kadlecsik <kadlec@...filter.org>,
        Florian Westphal <fw@...len.de>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Harald Welte <laforge@...filter.org>,
        "open list:NETFILTER" <netfilter-devel@...r.kernel.org>,
        "open list:NETFILTER" <coreteam@...filter.org>,
        "open list:NETWORKING [GENERAL]" <netdev@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        Lucas Leong <wmliang@...osec.exchange>, stable@...nel.org
Subject: Re: [PATCH nf] netfilter/xt_sctp: validate the flag_info count

On Mon, Aug 28, 2023 at 07:12:55PM -0300, Wander Lairson Costa wrote:
> sctp_mt_check doesn't validate the flag_count field. An attacker can
> take advantage of that to trigger a OOB read and leak memory
> information.
> 
> Add the field validation in the checkentry function.

Applied to nf, thanks