linux-kernel - Re: [PATCH v2 1/1] netfilter: nat: add a range check for l3/l4 protonum

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Date:   Tue, 4 Aug 2020 13:37:11 +0200
From:   Pablo Neira Ayuso <pablo@...filter.org>
To:     William Mcvicker <willmcvicker@...gle.com>
Cc:     security@...nel.org, Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>,
        Florian Westphal <fw@...len.de>,
        "David S. Miller" <davem@...emloft.net>,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        netfilter-devel@...r.kernel.org, coreteam@...filter.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-team@...roid.com, stable@...r.kernel.org
Subject: Re: [PATCH v2 1/1] netfilter: nat: add a range check for l3/l4
 protonum

Hi,

This patch is much smaller and if you confirm this is address the
issue, then this is awesome.

On Mon, Aug 03, 2020 at 06:31:56PM +0000, William Mcvicker wrote:
[...]
> diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
> index 31fa94064a62..56d310f8b29a 100644
> --- a/net/netfilter/nf_conntrack_netlink.c
> +++ b/net/netfilter/nf_conntrack_netlink.c
> @@ -1129,6 +1129,8 @@ ctnetlink_parse_tuple(const struct nlattr * const cda[],
>  	if (!tb[CTA_TUPLE_IP])
>  		return -EINVAL;
>  
> +	if (l3num >= NFPROTO_NUMPROTO)
> +		return -EINVAL;

l3num can only be either NFPROTO_IPV4 or NFPROTO_IPV6.

Other than that, bail out with EOPNOTSUPP.

Thank you.