linux-kernel - Re: [2.6 patch] net/llc/llc_conn.c: fix possible NULL dereference

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Message-Id: <E1HpHj7-0001M4-00@gondolin.me.apana.org.au>
Date:	Sat, 19 May 2007 15:43:37 +1000
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	eteo@...hat.com (Eugene Teo)
Cc:	linux-kernel@...r.kernel.org, acme@...hat.com,
	netdev@...r.kernel.org
Subject: Re: [2.6 patch] net/llc/llc_conn.c: fix possible NULL dereference

Eugene Teo <eteo@...hat.com> wrote:
>
> diff --git a/net/llc/llc_conn.c b/net/llc/llc_conn.c
> index 3b8cfbe..28a3994 100644
> --- a/net/llc/llc_conn.c
> +++ b/net/llc/llc_conn.c
> @@ -323,7 +323,8 @@ int llc_conn_remove_acked_pdus(struct sock *sk, u8 nr, u16
> *how_many_unacked)
> 
>        if (!q_len)
>                goto out;
> -       skb = skb_peek(&llc->pdu_unack_q);
> +       if (! (skb = skb_peek(&llc->pdu_unack_q)))
> +               goto out;

Actually we just checked that the queue length is non-zero so there
must be a packet there unless someone's just removed it.  If it were
possible for someone else to remove it in parallel, then we've got
bigger problems to worry about :)

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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