netdev - Re: [PATCH v2 net 1/5] icmp: introduce helper for NAT'd source address in network device context

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Date:   Mon, 10 Feb 2020 20:48:08 +0100
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     Netdev <netdev@...r.kernel.org>, David Miller <davem@...emloft.net>
Cc:     Florian Westphal <fw@...len.de>
Subject: Re: [PATCH v2 net 1/5] icmp: introduce helper for NAT'd source
 address in network device context

On Mon, Feb 10, 2020 at 3:15 PM Jason A. Donenfeld <Jason@...c4.com> wrote:
> +               ip_hdr(skb_in)->saddr = ct->tuplehash[0].tuple.src.u3.ip;
> +       }
> +       icmp_send(skb_in, type, code, info);

According to the comments in icmp_send, access to
ip_hdr(skb_in)->saddr requires first checking for `if
(skb_network_header(skb_in) < skb_in->head ||
(skb_network_header(skb_in) + sizeof(struct iphdr)) >
skb_tail_pointer(skb_in))` first to be safe. So, I'll fix this up for
v3, but will wait some time in case there are additional comments.

Jason