linux-kernel - Re: [PATCH] netfilter, ipvs: Avoid undefined order of evaluation in assignments to struct nf

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Message-ID: <20110529232337.GD5856@verge.net.au>
Date:	Mon, 30 May 2011 08:23:37 +0900
From:	Simon Horman <horms@...ge.net.au>
To:	Jesper Juhl <jj@...osbits.net>
Cc:	linux-kernel@...r.kernel.org, netfilter@...r.kernel.org,
	coreteam@...filter.org, netfilter-devel@...r.kernel.org,
	lvs-devel@...r.kernel.org, netdev@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Patrick McHardy <kaber@...sh.net>,
	Julian Anastasov <ja@....bg>,
	Wensong Zhang <wensong@...ux-vs.org>,
	Pablo Neira Ayuso <pablo@...filter.org>
Subject: Re: [PATCH] netfilter, ipvs: Avoid undefined order of evaluation in
 assignments to struct nf_conn *

On Sun, May 29, 2011 at 08:22:56PM +0200, Jesper Juhl wrote:
> In net/netfilter/ipvs/ip_vs_nfct.c::ip_vs_update_conntrack(),
> net/netfilter/ipvs/ip_vs_xmit.c::ip_vs_nat_xmit(), 
> net/netfilter/ipvs/ip_vs_xmit.c::ip_vs_nat_xmit_v6(), 
> net/netfilter/ipvs/ip_vs_xmit.c::ip_vs_icmp_xmit)() 
> net/netfilter/ipvs/ip_vs_xmit.c::and ip_vs_icmp_xmit_v6() we do this:
> 	...
> 	struct nf_conn *ct = ct = nf_ct_get(skb, &ctinfo);
> 	...
> 
> Since '=' is not a sequence point the order of these assignments happening 
> is undefined. Luckily it's easy to avoid by just doing what is obviously 
> the intended thing:
> 	struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
> 
> Signed-off-by: Jesper Juhl <jj@...osbits.net>

Acked-by: Simon Horman <horms@...ge.net.au>
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