linux-kernel - Re: Suspicious pattern for use of function xt_register

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Message-ID: <CAKXUXMwZo+HixV+zYWSNvTX0yJNXaFrxCF9hOJ-77upP8qKS0g@mail.gmail.com>
Date:   Mon, 23 Aug 2021 22:28:45 +0200
From:   Lukas Bulwahn <lukas.bulwahn@...il.com>
To:     Florian Westphal <fw@...len.de>
Cc:     Pablo Neira Ayuso <pablo@...filter.org>,
        Jozsef Kadlecsik <kadlec@...filter.org>,
        netfilter-devel@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Netdev <netdev@...r.kernel.org>, coreteam@...filter.org,
        clang-built-linux <clang-built-linux@...glegroups.com>
Subject: Re: Suspicious pattern for use of function xt_register_template()

On Mon, Aug 23, 2021 at 9:10 PM Florian Westphal <fw@...len.de> wrote:
>
> Lukas Bulwahn <lukas.bulwahn@...il.com> wrote:
> > Dear Florian, dear netfilter maintainers,
> >
> > Commit fdacd57c79b ("netfilter: x_tables: never register tables by
> > default") on linux-next
> > introduces the function xt_register_template() and in all cases but
> > one, the calls to that function are followed by:
> >
> >     if (ret < 0)
> >         return ret;
> >
> > All these checks were also added with the commit above.
> >
> > In the one case, for iptable_mangle_init() in
> > ./net/ipv4/netfilter/iptable_mangle.c, this pattern was not followed.
>
> Thats a bug, the error test is missing.

I send out a patch addressing the issue, please pick it:

https://lore.kernel.org/lkml/20210823202729.2009-1-lukas.bulwahn@gmail.com/

Thanks,

Lukas