netdev - Re: [PATCH net] sctp: fix the issue that the cookie-ack with auth can't get processed

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Message-ID: <20180502114758.GD13202@hmswarspite.think-freely.org>
Date:   Wed, 2 May 2018 07:47:58 -0400
From:   Neil Horman <nhorman@...driver.com>
To:     Xin Long <lucien.xin@...il.com>
Cc:     network dev <netdev@...r.kernel.org>, linux-sctp@...r.kernel.org,
        davem@...emloft.net,
        Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
Subject: Re: [PATCH net] sctp: fix the issue that the cookie-ack with auth
 can't get processed

On Wed, May 02, 2018 at 01:45:12PM +0800, Xin Long wrote:
> When auth is enabled for cookie-ack chunk, in sctp_inq_pop, sctp
> processes auth chunk first, then continues to the next chunk in
> this packet if chunk_end + chunk_hdr size < skb_tail_pointer().
> Otherwise, it will go to the next packet or discard this chunk.
> 
> However, it missed the fact that cookie-ack chunk's size is equal
> to chunk_hdr size, which couldn't match that check, and thus this
> chunk would not get processed.
> 
> This patch fixes it by changing the check to chunk_end + chunk_hdr
> size <= skb_tail_pointer().
> 
> Fixes: 26b87c788100 ("net: sctp: fix remote memory pressure from excessive queueing")
> Signed-off-by: Xin Long <lucien.xin@...il.com>
> ---
>  net/sctp/inqueue.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/net/sctp/inqueue.c b/net/sctp/inqueue.c
> index 23ebc53..eb93ffe 100644
> --- a/net/sctp/inqueue.c
> +++ b/net/sctp/inqueue.c
> @@ -217,7 +217,7 @@ struct sctp_chunk *sctp_inq_pop(struct sctp_inq *queue)
>  	skb_pull(chunk->skb, sizeof(*ch));
>  	chunk->subh.v = NULL; /* Subheader is no longer valid.  */
>  
> -	if (chunk->chunk_end + sizeof(*ch) < skb_tail_pointer(chunk->skb)) {
> +	if (chunk->chunk_end + sizeof(*ch) <= skb_tail_pointer(chunk->skb)) {
>  		/* This is not a singleton */
>  		chunk->singleton = 0;
>  	} else if (chunk->chunk_end > skb_tail_pointer(chunk->skb)) {
> -- 
> 2.1.0
> 
> --
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> 
Acked-by: Neil Horman <nhorman@...driver.com>