linux-kernel - Re: [PATCH] net: sctp: find the correct highest_new

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Message-ID: <20131122115612.GA27391@hmsreliant.think-freely.org>
Date:	Fri, 22 Nov 2013 06:56:12 -0500
From:	Neil Horman <nhorman@...driver.com>
To:	Chang Xiangzhong <changxiangzhong@...il.com>
Cc:	vyasevich@...il.com, davem@...emloft.net,
	linux-sctp@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: sctp: find the correct highest_new_tsn in sack

On Thu, Nov 21, 2013 at 10:56:28PM +0100, Chang Xiangzhong wrote:
> Function sctp_check_transmitted(transport t, ...) would iterate all of
> transport->transmitted queue and looking for the highest __newly__ acked tsn.
> The original algorithm would depend on the order of the assoc->transport_list
> (in function sctp_outq_sack line 1215 - 1226). The result might not be the
> expected due to the order of the tranport_list.
> 
> Solution: checking if the exising is smaller than the new one before assigning
> 
> Signed-off-by: Chang Xiangzhong <changxiangzhong@...il.com>
> ---
>  net/sctp/outqueue.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/net/sctp/outqueue.c b/net/sctp/outqueue.c
> index ef9e2bb..1b494fa 100644
> --- a/net/sctp/outqueue.c
> +++ b/net/sctp/outqueue.c
> @@ -1397,7 +1397,8 @@ static void sctp_check_transmitted(struct sctp_outq *q,
>  			 */
>  			if (!tchunk->tsn_gap_acked) {
>  				tchunk->tsn_gap_acked = 1;
> -				*highest_new_tsn_in_sack = tsn;
> +				if (TSN_lt(*highest_new_tsn_in_sack, tsn))
> +					*highest_new_tsn_in_sack = tsn;
>  				bytes_acked += sctp_data_size(tchunk);
>  				if (!tchunk->transport)
>  					migrate_bytes += sctp_data_size(tchunk);
> -- 
> 1.8.4.3
> 
> 

Acked-by: Neil Horman <nhorman@...driver.com>
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