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Date:	Mon, 29 Oct 2012 14:49:26 +0800
From:	Cong Wang <amwang@...hat.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>
Subject: Re: [Patch net-next] ipv6: fix a potential NULL deref

On Mon, 2012-10-29 at 07:10 +0100, Eric Dumazet wrote:
> > -		dst_release(&rt->dst);
> > +		if (rt)
> > +			dst_release(&rt->dst);
> >  	}
> >  
> 
> dst_release() is like kfree(), it accepts a NULL argument.
> 

'rt->dst' already dereferences 'rt', no matter dst_release() accepts
NULL or not.


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