linux-kernel - Re: [patch 03/83] cxgb3: Fix kernel crash caused by uninitialized l2t

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Date:	Thu, 11 Dec 2008 22:12:34 +0100
From:	Stefan Lippers-Hollmann <s.L-H@....de>
To:	Greg KH <gregkh@...e.de>
Cc:	linux-kernel@...r.kernel.org, stable@...nel.org,
	Roland Dreier <rolandd@...co.com>,
	Jeff Garzik <jgarzik@...hat.com>
Subject: Re: [patch 03/83] cxgb3: Fix kernel crash caused by uninitialized l2t_entry.arpq

Hi

On Donnerstag, 11. Dezember 2008, Greg KH wrote:
> 2.6.27-stable review patch.  If anyone has any objections, please let us know.
> 
> ------------------
> 
> From: Roland Dreier <rdreier@...co.com>
> 
> [ Upstream commit 6d329af9967e7ab3f4a3d7f1e8ef87539c3a069f ]
> 
> Commit 147e70e6 ("cxgb3: Use SKB list interfaces instead of home-grown
> implementation.") causes a crash in t3_l2t_send_slow() when an iWARP
> connection request is received.  This is because the new l2t_entry.arpq
> skb queue is never initialized, and therefore trying to add an skb to
> it causes a NULL dereference.  With the old code there was no need to
> initialize the queues because the l2t_entry structures were zeroed,
> and the code used NULL to mean empty.
> 
> Fix this by adding __skb_queue_head_init() when all the l2t_entry
> structures get allocated.

This patch doesn't compile.

> Signed-off-by: Roland Dreier <rolandd@...co.com>
> Signed-off-by: Jeff Garzik <jgarzik@...hat.com>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
> 
> ---
>  drivers/net/cxgb3/l2t.c |    1 +
>  1 file changed, 1 insertion(+)
> 
> --- a/drivers/net/cxgb3/l2t.c
> +++ b/drivers/net/cxgb3/l2t.c
> @@ -436,6 +436,7 @@ struct l2t_data *t3_init_l2t(unsigned in
>  	for (i = 0; i < l2t_capacity; ++i) {
>  		d->l2tab[i].idx = i;
>  		d->l2tab[i].state = L2T_STATE_UNUSED;
> +		__skb_queue_head_init(&d->l2tab[i].arpq);
>  		spin_lock_init(&d->l2tab[i].lock);
>  		atomic_set(&d->l2tab[i].refcnt, 0);
>  	}

  CC [M]  drivers/net/cxgb3/cxgb3_main.o
  CC [M]  drivers/net/cxgb3/ael1002.o
  CC [M]  drivers/net/cxgb3/vsc8211.o
  CC [M]  drivers/net/cxgb3/t3_hw.o
  CC [M]  drivers/net/cxgb3/mc5.o
  CC [M]  drivers/net/cxgb3/xgmac.o
  CC [M]  drivers/net/cxgb3/sge.o
  CC [M]  drivers/net/cxgb3/l2t.o
drivers/net/cxgb3/l2t.c: In function ‘t3_init_l2t’:
drivers/net/cxgb3/l2t.c:439: error: implicit declaration of function ‘__skb_queue_head_init’
drivers/net/cxgb3/l2t.c:439: error: ‘struct l2t_entry’ has no member named ‘arpq’
make[3]: *** [drivers/net/cxgb3/l2t.o] Error 1
make[2]: *** [drivers/net/cxgb3] Error 2
make[1]: *** [drivers/net] Error 2
make: *** [drivers] Error 2

It seems to depend on

commit 147e70e62fdd5af6263106ad634b03c5154c1e56
Author: David S. Miller <davem@...emloft.net>
Date:   Mon Sep 22 01:29:52 2008 -0700

    cxgb3: Use SKB list interfaces instead of home-grown implementation.

    Signed-off-by: David S. Miller <davem@...emloft.net>

Regards
	Stefan Lippers-Hollmann

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