netdev - Re: [PATCH 2/3] [LLC]: bogus llc packet length

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Date:	Fri, 28 Mar 2008 10:13:17 -0300
From:	Arnaldo Carvalho de Melo <acme@...hat.com>
To:	Joonwoo Park <joonwpark81@...il.com>
Cc:	davem@...emloft.net, Arnaldo Carvalho de Melo <acme@...hat.com>,
	netdev@...r.kernel.org
Subject: Re: [PATCH 2/3] [LLC]: bogus llc packet length

Em Fri, Mar 28, 2008 at 04:59:35PM +0900, Joonwoo Park escreveu:
> discard llc packet which has bogus packet length.
> 
> Signed-off-by: Joonwoo Park <joonwpark81@...il.com>
> Acked-by: Arnaldo Carvalho de Melo <acme@...hat.com>

Dave, can you please apply this one?

>  net/llc/llc_input.c |    6 +++++-
>  1 files changed, 5 insertions(+), 1 deletions(-)
> 
> diff --git a/net/llc/llc_input.c b/net/llc/llc_input.c
> index c40c9b2..bfd2567 100644
> --- a/net/llc/llc_input.c
> +++ b/net/llc/llc_input.c
> @@ -117,8 +117,12 @@ static inline int llc_fixup_skb(struct sk_buff *skb)
>  	skb_pull(skb, llc_len);
>  	if (skb->protocol == htons(ETH_P_802_2)) {
>  		__be16 pdulen = eth_hdr(skb)->h_proto;
> -		u16 data_size = ntohs(pdulen) - llc_len;
> +		s32 data_size = ntohs(pdulen) - llc_len;
>  
> +		if (data_size < 0 ||
> +		    ((skb_tail_pointer(skb) -
> +		      (u8 *)pdu) - llc_len) < data_size)
> +			return 0;
>  		if (unlikely(pskb_trim_rcsum(skb, data_size)))
>  			return 0;
>  	}
> -- 
> 1.5.4.3
> 
> --
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