linux-kernel - Re: bridge/netfilter: regression in 2.6.39.1

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Message-ID: <1307129642.2600.2.camel@edumazet-laptop>
Date:	Fri, 03 Jun 2011 21:34:02 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Alexander Holler <holler@...oftware.de>
Cc:	linux-kernel@...r.kernel.org, David Miller <davem@...emloft.net>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	netdev@...r.kernel.org
Subject: Re: bridge/netfilter: regression in 2.6.39.1

Le vendredi 03 juin 2011 à 21:21 +0200, Alexander Holler a écrit :
> Hello,
> 
> I'm getting a oops in the bridge code in br_change_mtu() with 2.6.39.1. 
> The patch below seems to fix that.
> 
> I'm not sure about the usage of dst_cow_metrics_generic() in 
> fake_dst_ops, but after having a quick look at it seems to be ok to use 
> that here.
> 
> Regards,
> 
> Alexander
> 
> -----
>  From 3c1d5951af73389798afeea672ec224e195b8e8d Mon Sep 17 00:00:00 2001
> From: Alexander Holler <holler@...oftware.de>
> Date: Fri, 3 Jun 2011 20:43:06 +0200
> Subject: [PATCH] bridge: add dst_cow_metrics_generic to fake_dst_ops
> 
> Commit 42923465fb8d025a2b5153f2e7ab1e6e1058bf00 does here what it
> should prevent, it introduces NULL a dereference.
> 

I cant find this commit in known trees. Could you give the real commit
id and its title ?

> The above commit uses dst_init_metrics() which sets the metrics as
> read only. As result br_change_mtu() dies in dst_metric_set()
> which calls dst_metrics_write_ptr() which calls
> dst->ops->cow_metrics() if the metrics are read only.
> ---
>   net/bridge/br_netfilter.c |    1 +
>   1 files changed, 1 insertions(+), 0 deletions(-)
> 
> diff --git a/net/bridge/br_netfilter.c b/net/bridge/br_netfilter.c
> index 5f9c091..de982a1 100644
> --- a/net/bridge/br_netfilter.c
> +++ b/net/bridge/br_netfilter.c
> @@ -107,6 +107,7 @@ static void fake_update_pmtu(struct dst_entry *dst, 
> u32 mtu)
>   static struct dst_ops fake_dst_ops = {
>          .family =               AF_INET,
>          .protocol =             cpu_to_be16(ETH_P_IP),
> +       .cow_metrics =          dst_cow_metrics_generic,
>          .update_pmtu =          fake_update_pmtu,
>   };
> 

Your patch is mangled (white spaces instead of tabulations)

Thanks


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