netdev - Re : Bug in using inet

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Message-ID: <867900.85129.qm@web26107.mail.ukl.yahoo.com>
Date:	Wed, 14 Nov 2007 13:12:11 +0000 (GMT)
From:	Nj A <nj_a83@...oo.fr>
To:	Evgeniy Polyakov <johnpol@....mipt.ru>
Cc:	netdev@...r.kernel.org
Subject: Re : Bug in using inet_lookup ()

I suspected it could be that. However, can't see in ip_rcv the right portion that can help.
Any further tip please?

Regards,
----- Message d'origine ----
> De : Evgeniy Polyakov <johnpol@....mipt.ru>
> À : Nj A <nj_a83@...oo.fr>
> Cc : netdev@...r.kernel.org
> Envoyé le : Mercredi, 14 Novembre 2007, 12h13mn 05s
> Objet : Re: Bug in using inet_lookup ()
> 
> On Wed, Nov 14, 2007 at 09:26:18AM +0000, Nj A (nj_a83@...oo.fr) wrote:
> > /* The kernel TCP hashtable */
> > struct inet_hashinfo __cacheline_aligned tcp_hashinfo = {
> > .lhash_lock = __RW_LOCK_UNLOCKED (tcp_hashinfo.lhash_lock),
> > .lhash_users = ATOMIC_INIT (0),
> > .lhash_wait = __WAIT_QUEUE_HEAD_INITIALIZER (tcp_hashinfo.lhash_wait),
> > };
> > ...
> > struct sock *sk;
> > struct sk_buff *skb;
> > skb = alloc_skb (MAX_TCP_HEADER + 15, GFP_KERNEL);
> > if (skb == NULL)
> > printk ("%s: Unable to allocate memory \n", __FUNCTION__);
> > sk = inet_lookup (&tcp_hashinfo, ip_src, src_port, ip_dst, dst_port, inet_iif
> (skb));
> > if (!sk)
> > ...
> > This portion of code seems to cause the kernel to panic due to dereferencing a
> NULL pointer.
> > Can anyone please tell me what is the error above?
> > Best Regards,
> 
> Where exactly? Likely in inet_iif(), since it dereferences dst (routing
> info), which is not presented after simple alloc_skb().
> You have to setup skb correctly, check how ip_rcv() does it.
> 
> -- 
> Evgeniy
> Polyakov
>


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