Subject: Re: [Patch net-next] ipv6: fix a potential NULL deref

From: Cong Wang <[email-masked]>
Date: Mon, 29 Oct 2012 14:49:26 +0800

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.