linux-kernel - Re: [PATCH] netfilter: conntrack: remove uninitialized shadow variable

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Message-Id: <20160510.010418.1148844422449581387.davem@davemloft.net>
Date:	Tue, 10 May 2016 01:04:18 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	arnd@...db.de
Cc:	pablo@...filter.org, kaber@...sh.net, kadlec@...ckhole.kfki.hu,
	fw@...len.de, daniel@...earbox.net, sasha.levin@...cle.com,
	netfilter-devel@...r.kernel.org, coreteam@...filter.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] netfilter: conntrack: remove uninitialized shadow
 variable

From: Arnd Bergmann <arnd@...db.de>
Date: Mon,  9 May 2016 21:47:23 +0200

> A recent commit introduced an unconditional use of an uninitialized
> variable, as reported in this gcc warning:
> 
> net/netfilter/nf_conntrack_core.c: In function '__nf_conntrack_confirm':
> net/netfilter/nf_conntrack_core.c:632:33: error: 'ctinfo' may be used uninitialized in this function [-Werror=maybe-uninitialized]
>    bytes = atomic64_read(&counter[CTINFO2DIR(ctinfo)].bytes);
>                                  ^
> net/netfilter/nf_conntrack_core.c:628:26: note: 'ctinfo' was declared here
>    enum ip_conntrack_info ctinfo;
> 
> The problem is that a local variable shadows the function parameter.
> This removes the local variable, which looks like what Pablo originally
> intended.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> Fixes: 71d8c47fc653 ("netfilter: conntrack: introduce clash resolution on insertion race")

Applied.