linux-kernel - Re: [PATCH 01/28] [v2] netfilter: nf_tables: avoid uninitialized variable warning

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Message-ID: <20161018152354.GA2759@salvia>
Date:   Tue, 18 Oct 2016 17:23:54 +0200
From:   Pablo Neira Ayuso <pablo@...filter.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Patrick McHardy <kaber@...sh.net>,
        Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>,
        "David S. Miller" <davem@...emloft.net>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, netfilter-devel@...r.kernel.org,
        coreteam@...filter.org, netdev@...r.kernel.org
Subject: Re: [PATCH 01/28] [v2] netfilter: nf_tables: avoid uninitialized
 variable warning

On Tue, Oct 18, 2016 at 12:05:30AM +0200, Arnd Bergmann wrote:
> The newly added nft_range_eval() function handles the two possible
> nft range operations, but as the compiler warning points out,
> any unexpected value would lead to the 'mismatch' variable being
> used without being initialized:
> 
> net/netfilter/nft_range.c: In function 'nft_range_eval':
> net/netfilter/nft_range.c:45:5: error: 'mismatch' may be used uninitialized in this function [-Werror=maybe-uninitialized]
> 
> This removes the variable in question and instead moves the
> condition into the switch itself, which is potentially more
> efficient than adding a bogus 'default' clause as in my
> first approach, and is nicer than using the 'uninitialized_var'
> macro.

Applied to the nf tree, thanks Arnd.