netdev - Re: [PATCH net-next v4 1/2] net sched actions: Add support for user cookies

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Message-ID: <CAM_iQpUfvSCJ6j+GsefShWK++tfuBr=buWauBY81gaOpqvN=gA@mail.gmail.com>
Date:   Tue, 17 Jan 2017 10:40:31 -0800
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Jamal Hadi Salim <jhs@...atatu.com>
Cc:     David Miller <davem@...emloft.net>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        Jiri Pirko <jiri@...lanox.com>, paulb@...lanox.com,
        John Fastabend <john.fastabend@...il.com>,
        Simon Horman <simon.horman@...ronome.com>,
        Roman Mashak <mrv@...atatu.com>,
        Hadar Har-Zion <hadarh@...lanox.com>,
        Or Gerlitz <ogerlitz@...lanox.com>,
        Roi Dayan <roid@...lanox.com>,
        Daniel Borkmann <daniel@...earbox.net>
Subject: Re: [PATCH net-next v4 1/2] net sched actions: Add support for user cookies

On Tue, Jan 17, 2017 at 3:11 AM, Jamal Hadi Salim <jhs@...atatu.com> wrote:
> @@ -575,6 +583,23 @@ struct tc_action *tcf_action_init_1(struct net *net, struct nlattr *nla,
>         if (err < 0)
>                 goto err_mod;
>
> +       if (tb[TCA_ACT_COOKIE]) {
> +               if (nla_len(tb[TCA_ACT_COOKIE]) > TC_COOKIE_MAX_SIZE) {
> +                       err = -EINVAL;
> +                       goto err_mod;
> +               }
> +
> +               a->act_ck = kzalloc(sizeof(*a->act_ck), GFP_KERNEL);
> +               if (unlikely(!a->act_ck)) {
> +                       err = -ENOMEM;
> +                       goto err_mod;
> +               }
> +

I am afraid you can't just goto err_mod for error case here, b/c ->init()
is already called before this, you probably either have to call ->destroy()
for error path, or move this before ->init().