linux-kernel - Re: [PATCH] netfilter: initialize 'ret' variable

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Date:   Fri, 2 Dec 2022 10:18:44 +0100 (CET)
From:   Jan Engelhardt <jengelh@...i.de>
To:     Al Viro <viro@...iv.linux.org.uk>
cc:     Li Qiong <liqiong@...china.com>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        Jozsef Kadlecsik <kadlec@...filter.org>,
        Florian Westphal <fw@...len.de>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, netfilter-devel@...r.kernel.org,
        kernel-janitors@...r.kernel.org, coreteam@...filter.org,
        Yu Zhe <yuzhe@...china.com>
Subject: Re: [PATCH] netfilter: initialize 'ret' variable

On Friday 2022-12-02 08:13, Al Viro wrote:

>On Fri, Dec 02, 2022 at 03:03:31PM +0800, Li Qiong wrote:
>> The 'ret' should need to be initialized to 0, in case
>> return a uninitialized value.
>
>Why is 0 the right value?  And which case would it be?
>We clearly need to know that to figure out which return
>value would be correct for it...

Judging from the error-handling branches,
it should be ret = NF_ACCEPT.