netdev - Re: [PATCH v1] net/ethtool/tunnels: check the return value of nla_nest

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Message-ID: <CAMEuxRrRJ6RZQ5Pjoxb+5cn1Z5iKZNvZ_ydATBwB1NV5S-pEog@mail.gmail.com>
Date:   Wed, 21 Sep 2022 01:31:06 -0700
From:   Li Zhong <floridsleeves@...il.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        pabeni@...hat.com, edumazet@...gle.com, davem@...emloft.net
Subject: Re: [PATCH v1] net/ethtool/tunnels: check the return value of nla_nest_start()

On Tue, Sep 20, 2022 at 12:41 PM Jakub Kicinski <kuba@...nel.org> wrote:
>
> On Tue, 20 Sep 2022 12:31:29 -0700 Li Zhong wrote:
> > On Tue, Sep 20, 2022 at 11:37 AM Jakub Kicinski <kuba@...nel.org> wrote:
> > > On Fri, 16 Sep 2022 19:26:02 -0700 Li Zhong wrote:
> > > >                       goto err_cancel_table;
> > > >
> > > >               entry = nla_nest_start(skb, ETHTOOL_A_TUNNEL_UDP_TABLE_ENTRY);
> > > > +             if (!entry)
> > > > +                     return -EMSGSIZE;
> > >
> > > not even correct, and completely harmless
> >
> > Thanks for your reply. Maybe a more suitable way of error handling is 'goto
> > err_cancel_table;'?
>
> Yes, but you _most_ provide the detailed analysis of the impact
> in the commit message for the patches to be considered for merging.

Thanks for the suggestion. The commit message is updated with more details.