netdev - Re: [PATCH net 01/16] net/sched: prepare TC actions to properly validate the control action

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Date:   Wed, 27 Feb 2019 17:28:26 -0800
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Davide Caratti <dcaratti@...hat.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Jiri Pirko <jiri@...nulli.us>,
        Vlad Buslov <vladbu@...lanox.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: [PATCH net 01/16] net/sched: prepare TC actions to properly
 validate the control action

On Wed, Feb 27, 2019 at 9:41 AM Davide Caratti <dcaratti@...hat.com> wrote:
> +int tcf_action_check_ctrlact(int action, struct tcf_proto *tp,
> +                            struct tcf_chain **handle,


Please use a better name than 'handle'. 'handle' is usually used
for a hex numeric ID. Here you just want to save the allocated
tcf_chain to this address.


> +                            struct netlink_ext_ack *extack)
> +{
> +       int opcode = TC_ACT_EXT_OPCODE(action), ret = -EINVAL;
> +       u32 chain_index;
> +
> +       if (!opcode)
> +               ret = action > TC_ACT_VALUE_MAX ? -EINVAL : 0;
> +       else if (opcode <= TC_ACT_EXT_OPCODE_MAX || action == TC_ACT_UNSPEC)
> +               ret = 0;
> +       if (ret) {
> +               NL_SET_ERR_MSG(extack, "invalid control action");
> +               goto end;
> +       }
> +
> +       if (TC_ACT_EXT_CMP(action, TC_ACT_GOTO_CHAIN)) {
> +               chain_index = action & TC_ACT_EXT_VAL_MASK;
> +               if (!tp) {
> +                       ret = -EINVAL;
> +                       NL_SET_ERR_MSG(extack,
> +                                      "can't use goto_chain with NULL proto");
> +                       goto end;
> +               }
> +               if (!handle) {
> +                       ret = -EINVAL;
> +                       NL_SET_ERR_MSG(extack,
> +                                      "can't put goto_chain on NULL handle");
> +                       goto end;
> +               }
> +               *handle = tcf_chain_get_by_act(tp->chain->block, chain_index);
> +               if (!*handle) {
> +                       ret = -ENOMEM;

Is -ENOMEM okay here? I feel like it should be -ENOSPC or whatever
tcf_chain_get_by_act() says.

Thanks.