netdev - Re: [BUG?] tcp: potential bug in tcp_is_sackblock

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Date:	Sun, 18 Sep 2011 21:35:44 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	"Yan, Zheng" <zheng.z.yan@...el.com>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"davem@...emloft.net" <davem@...emloft.net>,
	herbert@...dor.apana.org.au,
	"sfr@...b.auug.org.au" <sfr@...b.auug.org.au>
Subject: Re: [BUG?] tcp: potential bug in tcp_is_sackblock_valid()

Le vendredi 09 septembre 2011 à 09:45 +0800, Yan, Zheng a écrit :
> Hi all,
> 
> I found a check in tcp_is_sackblock_valid() is suspicious. It against
> its comment and RFC. I think the correct check should be:
> 
> ---
> diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
> index 385c470..a5d01b1 100644
> --- a/net/ipv4/tcp_input.c
> +++ b/net/ipv4/tcp_input.c
> @@ -1124,7 +1124,7 @@ static int tcp_is_sackblock_valid(struct tcp_sock *tp, int is_dsack,
>                 return 0;
>  
>         /* ...Then it's D-SACK, and must reside below snd_una completely */
> -       if (!after(end_seq, tp->snd_una))
> +       if (after(end_seq, tp->snd_una))
>                 return 0;
>  
>         if (!before(start_seq, tp->undo_marker))
> ---

Acked-by: Eric Dumazet <eric.dumazet@...il.com>

This bug was introduced in 2.6.24 by commit 5b3c9882



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