netdev - Re: [PATCH net-next] ipvs: Avoid null-pointer deref in debug code

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Message-ID: <5432BBB8.9070206@fb.com>
Date:	Mon, 6 Oct 2014 08:56:40 -0700
From:	Alex Gartrell <agartrell@...com>
To:	Julian Anastasov <ja@....bg>
CC:	<horms@...ge.net.au>, <dan.carpenter@...cle.com>,
	<lvs-devel@...r.kernel.org>, <netdev@...r.kernel.org>,
	<kernel-team@...com>
Subject: Re: [PATCH net-next] ipvs: Avoid null-pointer deref in debug code

Hey Julian,

On 10/05/2014 11:49 PM, Julian Anastasov wrote:
>
> 	You have to print the "daddr" variable as
> it was done before your patchset in the
> "Stopping traffic to %s address, dest: %p..." message
> because dest is not present in all cases, for example,
> for *bypass_xmit. Other places provide cp->daddr but
> for backup server some conns can live without cp->dest.

I've sent an updated patch that does this but I have some questions 
about other stuff that I find mildly confusing.  Specifically I didn't 
realize until looking at the call sites that !dest || daddr = 
dest->addr.ip (but maybe I'm wrong?)

If that's the case, why do we have the following line in __ip_vs_get_out_rt?

                 daddr = dest->addr.ip;

If that's /always/ true then we should add the following line or a 
comment to the same effect to clarify

	BUG_ON(dest && dest->addr.ip != daddr);

If that's not intended to always be true, then should the patch be the 
following?

	...%pI4", dest ? &dest->addr.ip : &daddr);

Thanks,
-- 
Alex Gartrell <agartrell@...com>
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