netdev - Re: [PATCH 1/1] GSO: Reload iph after pskb_may

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Date:   Mon, 28 Nov 2016 08:34:59 -0800
From:   Alexander Duyck <alexander.duyck@...il.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     David Miller <davem@...emloft.net>,
        Eric Dumazet <eric.dumazet@...il.com>,
        Alexander Duyck <aduyck@...antis.com>,
        Andrey Konovalov <andreyknvl@...gle.com>,
        Linux Networking Development Mailing List 
        <netdev@...r.kernel.org>
Subject: Re: [PATCH 1/1] GSO: Reload iph after pskb_may_pull

On Mon, Nov 28, 2016 at 7:36 AM, Arnaldo Carvalho de Melo
<acme@...nel.org> wrote:
> As it may get stale and lead to use after free.
>
> Acked-by: Eric Dumazet <eric.dumazet@...il.com>
> Cc: Alexander Duyck <aduyck@...antis.com>
> Cc: Andrey Konovalov <andreyknvl@...gle.com>
> Fixes: cbc53e08a793 ("GSO: Add GSO type for fixed IPv4 ID")
> Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
> ---
>  net/ipv4/af_inet.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
> index 5ddf5cda07f4..215143246e4b 100644
> --- a/net/ipv4/af_inet.c
> +++ b/net/ipv4/af_inet.c
> @@ -1233,7 +1233,7 @@ struct sk_buff *inet_gso_segment(struct sk_buff *skb,
>                 fixedid = !!(skb_shinfo(skb)->gso_type & SKB_GSO_TCP_FIXEDID);
>
>                 /* fixed ID is invalid if DF bit is not set */
> -               if (fixedid && !(iph->frag_off & htons(IP_DF)))
> +               if (fixedid && !(ip_hdr(skb)->frag_off & htons(IP_DF)))
>                         goto out;
>         }
>
> --
> 2.9.3
>

Looks good to me.

Acked-by: Alexander Duyck <alexander.h.duyck@...el.com>