netdev - Re: IPv6: race condition in __ipv6_ifa_notify() and dst

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Message-Id: <20100422.004324.67422011.davem@davemloft.net>
Date:	Thu, 22 Apr 2010 00:43:24 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	herbert@...dor.apana.org.au
Cc:	jbohac@...e.cz, yoshfuji@...ux-ipv6.org, netdev@...r.kernel.org,
	shemminger@...tta.com
Subject: Re: IPv6: race condition in __ipv6_ifa_notify() and dst_free() ?

From: Herbert Xu <herbert@...dor.apana.org.au>
Date: Thu, 22 Apr 2010 10:32:11 +0800

> Anyway, I think the root of the issue is the fact that NDISC is
> calling addrconf_dad_failure with no locking whatsoever.  The
> latter is not idempotent so some form of locking is needed.
> 
> This bug appears to have been around since the very start.
> 
> I'll dig deeper to see where we might be able to add some locks.

Thanks Herbert.
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