netdev - Re: [PATCH] ipv6: fix race condition regarding dst->expires and dst->from.

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Date:	Wed, 20 Feb 2013 19:25:19 +0900
From:	YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>
To:	YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>
CC:	David Miller <davem@...emloft.net>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Neil Horman <nhorman@...driver.com>,
	Gao feng <gaofeng@...fujitsu.com>,
	netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH] ipv6: fix race condition regarding dst->expires and dst->from.

YOSHIFUJI Hideaki wrote:

> -static inline void rt6_update_expires(struct rt6_info *rt, int timeout)
> +static inline void rt6_update_expires(struct rt6_info *rt0, int timeout)
>  {
> -	if (!(rt->rt6i_flags & RTF_EXPIRES)) {
> -		if (rt->dst.from)
> -			dst_release(rt->dst.from);
> -		/* dst_set_expires relies on expires == 0 
> -		 * if it has not been set previously.
> -		 */
> -		rt->dst.expires = 0;
> -	}
> -
> -	dst_set_expires(&rt->dst, timeout);
> -	rt->rt6i_flags |= RTF_EXPIRES;
> +	struct rt6_info *rt;
> +
> +	for (rt = rt0; rt && !(rt->rt6i_flags & RTF_EXPIRES); rt = rt->dst.from);
> +	if (rt && rt != rt0)
> +		rt0->dst.expires = rt->dst.expires;
> +
> +	dst_set_expires(&rt0->dst, timeout);
> +	rt0->rt6i_flags |= RTF_EXPIRES;
>  }
>  

Oops, I sent wrong version, will resend.

--yoshfuji
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