linux-kernel - Re: [2.6.33-rc5 regression] NULL pointer dereference in vlan_skb_recv - probably introduced by commit 9793241fe92f7d9303fb221e43fc598eb065f267

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Message-ID: <20100124201808.2bbbf0b0@neptune.home>
Date:	Sun, 24 Jan 2010 20:18:08 +0100
From:	Bruno Prémont <bonbons@...ux-vserver.org>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Américo Wang <xiyou.wangcong@...il.com>,
	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [2.6.33-rc5 regression] NULL pointer dereference in
 vlan_skb_recv - probably introduced by commit
 9793241fe92f7d9303fb221e43fc598eb065f267

Yep, works fine and RX stats look right as well.

So
Reported-By: Bruno Prémont <bonbons@...ux-vserver.org>
Tested-By: Bruno Prémont <bonbons@...ux-vserver.org>

Thanks,
Bruno


On Sun, 24 January 2010 Eric Dumazet <eric.dumazet@...il.com> wrote:
> Ok, I believe I found the problem :)
> 
> Please try following patch, if it works I'll submit with appropriate
> Changelog and signatures
> 
> Thanks
> 
> 
> diff --git a/net/8021q/vlan_dev.c b/net/8021q/vlan_dev.c
> index b788978..c1b92ca 100644
> --- a/net/8021q/vlan_dev.c
> +++ b/net/8021q/vlan_dev.c
> @@ -163,7 +163,7 @@ int vlan_skb_recv(struct sk_buff *skb, struct net_device *dev,
>               goto err_unlock;
>  	}
>  
> -	rx_stats = per_cpu_ptr(vlan_dev_info(dev)->vlan_rx_stats,
> +	rx_stats = per_cpu_ptr(vlan_dev_info(skb->dev)->vlan_rx_stats,
>                              smp_processor_id());
>       rx_stats->rx_packets++;
>  	rx_stats->rx_bytes += skb->len;
--
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