linux-kernel - Re: [BUG] Crash with NULL pointer dereference in bond_handle

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Date:	Thu, 28 Mar 2013 13:44:06 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Jiri Pirko <jpirko@...hat.com>,
	Andy Gospodarek <andy@...yhouse.net>,
	"David S. Miller" <davem@...emloft.net>,
	LKML <linux-kernel@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>,
	Nicolas de Pesloüan 
	<nicolas.2p.debian@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Guy Streeter <streeter@...hat.com>,
	"Paul E. McKenney" <paulmck@...ibm.com>
Subject: Re: [BUG] Crash with NULL pointer dereference in bond_handle_frame
 in -rt (possibly mainline)

On Thu, 2013-03-28 at 10:29 -0700, Eric Dumazet wrote:

> Nothing :(
> 
> bug introduced in commit 35d48903e9781975e823b359ee85c257c9ff5c1c
> (bonding: fix rx_handler locking)
> 
> CC Jiri
> 
> Fix seems simple :
> 
> diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
> index 6bbd90e..7956ca5 100644
> --- a/drivers/net/bonding/bond_main.c
> +++ b/drivers/net/bonding/bond_main.c
> @@ -1457,6 +1457,8 @@ static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
>  	*pskb = skb;
>  
>  	slave = bond_slave_get_rcu(skb->dev);
> +	if (!slave)
> +		return ret;

Thanks! That's basically what I thought, but wanted to make sure there's
wasn't some other synchronization that I may have been missing.

-- Steve

>  	bond = slave->bond;
>  
>  	if (bond->params.arp_interval)
> 
> 


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