netdev - Re: [PATCH] ipvs: initialize 'ret' variable in do_ip_vs_set

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Date:   Fri, 2 Dec 2022 18:18:37 +0800
From:   liqiong <liqiong@...china.com>
To:     Dan Carpenter <error27@...il.com>,
        Peilin Ye <yepeilin.cs@...il.com>
Cc:     Simon Horman <horms@...ge.net.au>, Julian Anastasov <ja@....bg>,
        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, lvs-devel@...r.kernel.org,
        netfilter-devel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        coreteam@...filter.org, Yu Zhe <yuzhe@...china.com>
Subject: Re: [PATCH] ipvs: initialize 'ret' variable in do_ip_vs_set_ctl()



在 2022年12月02日 18:07, Dan Carpenter 写道:
> On Fri, Dec 02, 2022 at 11:25:11AM +0800, Li Qiong wrote:
>> The 'ret' should need to be initialized to 0, in case
>> return a uninitialized value because no default process
>> for "switch (cmd)".
>>
>> Signed-off-by: Li Qiong <liqiong@...china.com>
> If this is a real bug, then it needs a fixes tag.  The fixes tag helps
> us know whether to back port or not and it also helps in reviewing the
> patch.  Also get_maintainer.pl will CC the person who introduced the
> bug so they can review it.  They are normally the best person to review
> their own code.
>
> Here it would be:
> Fixes: c5a8a8498eed ("ipvs: Fix uninit-value in do_ip_vs_set_ctl()")
>
> Which is strange...  Also it suggest that the correct value is -EINVAL
> and not 0.
>
> The thing about uninitialized variable bugs is that Smatch and Clang
> both warn about them so they tend to get reported pretty quick.
> Apparently neither Nathan nor I sent forwarded this static checker
> warning.  :/
>
> regards,
> dan carpenter

It is not a real bug,   I  use tool (eg: smatch, sparse) to audit the code,  got this warning and check it,
found may be a real problem.