netdev - Re: [PATCH] ipv6: fix NULL reference in proxy neighbor discovery

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Date:	Wed, 23 Jun 2010 23:44:10 +0900
From:	YOSHIFUJI Hideaki <hideaki@...hifuji.org>
To:	Stephen Hemminger <shemminger@...tta.com>,
	David Miller <davem@...emloft.net>
CC:	Andreas Klauer <Andreas.Klauer@...amorpher.de>,
	Hagen Paul Pfeifer <hagen@...u.net>, netdev@...r.kernel.org,
	Octavian Purdila <opurdila@...acom.com>,
	YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>
Subject: Re: [PATCH] ipv6: fix NULL reference in proxy neighbor discovery

Acked-by: YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>

(2010/06/22 6:00), Stephen Hemminger wrote:
> The addition of TLLAO option created a kernel OOPS regression
> for the case where neighbor advertisement is being sent via
> proxy path.  When using proxy, ipv6_get_ifaddr() returns NULL
> causing the NULL dereference.
> 
> Change causing the bug was:
> commit f7734fdf61ec6bb848e0bafc1fb8bad2c124bb50
> Author: Octavian Purdila<opurdila@...acom.com>
> Date:   Fri Oct 2 11:39:15 2009 +0000
> 
>      make TLLAO option for NA packets configurable
> 
> Signed-off-by: Stephen Hemminger<shemminger@...tta.com>
> 
> ---
> Patch for -net and -stable.
> Applies to 2.6.33 and later.
> 
> --- a/net/ipv6/ndisc.c	2010-06-11 08:13:13.008657498 -0700
> +++ b/net/ipv6/ndisc.c	2010-06-21 13:52:57.961486303 -0700
> @@ -586,6 +586,7 @@ static void ndisc_send_na(struct net_dev
>   		src_addr = solicited_addr;
>   		if (ifp->flags&  IFA_F_OPTIMISTIC)
>   			override = 0;
> +		inc_opt |= ifp->idev->cnf.force_tllao;
>   		in6_ifa_put(ifp);
>   	} else {
>   		if (ipv6_dev_get_saddr(dev_net(dev), dev, daddr,
> @@ -599,7 +600,6 @@ static void ndisc_send_na(struct net_dev
>   	icmp6h.icmp6_solicited = solicited;
>   	icmp6h.icmp6_override = override;
> 
> -	inc_opt |= ifp->idev->cnf.force_tllao;
>   	__ndisc_send(dev, neigh, daddr, src_addr,
>   		&icmp6h, solicited_addr,
>   		     inc_opt ? ND_OPT_TARGET_LL_ADDR : 0);
> --
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