linux-kernel - Re: BUG: unable to handle kernel NULL pointer dereference in ipv6_select

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Message-ID: <20111222075830.GR6348@secunet.com>
Date:	Thu, 22 Dec 2011 08:58:30 +0100
From:	Steffen Klassert <steffen.klassert@...unet.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Chris Boot <bootc@...tc.net>, lkml <linux-kernel@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>
Subject: Re: BUG: unable to handle kernel NULL pointer dereference in
 ipv6_select_ident

On Thu, Dec 22, 2011 at 08:51:17AM +0100, Eric Dumazet wrote:
> 
> Prior to 618f9bc74a0, we were calling 
> 
> static inline u32 dst_mtu(const struct dst_entry *dst)
>  {
>        u32 mtu = dst_metric_raw(dst, RTAX_MTU);
> 
>        if (!mtu)
>                mtu = dst->ops->mtu(dst);
> 
>        return mtu;
> }
> 
> with dst = fake_rtable
> 
> and we did :
> 
> dst_init_metrics(&rt->dst, br_dst_default_metrics, true);
> 
> so dst_metric_raw(dst, RTAX_MTU) was returning 1500
> 
> So bug is new, we dont need to backport this fix.
> 

Ok, I see. Thanks for pointing it out!
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