netdev - Re: [PATCH net v2] net: sched: cls_flower: validate nested enc_opts

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Date:   Sat, 10 Nov 2018 08:18:03 +0100
From:   Jiri Pirko <jiri@...nulli.us>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>
Cc:     davem@...emloft.net, oss-drivers@...ronome.com,
        netdev@...r.kernel.org
Subject: Re: [PATCH net v2] net: sched: cls_flower: validate nested
 enc_opts_policy to avoid warning

Sat, Nov 10, 2018 at 06:06:26AM CET, jakub.kicinski@...ronome.com wrote:
>TCA_FLOWER_KEY_ENC_OPTS and TCA_FLOWER_KEY_ENC_OPTS_MASK can only
>currently contain further nested attributes, which are parsed by
>hand, so the policy is never actually used resulting in a W=1
>build warning:
>
>net/sched/cls_flower.c:492:1: warning: ‘enc_opts_policy’ defined but not used [-Wunused-const-variable=]
> enc_opts_policy[TCA_FLOWER_KEY_ENC_OPTS_MAX + 1] = {
>
>Add the validation anyway to avoid potential bugs when other
>attributes are added and to make the attribute structure slightly
>more clear.  Validation will also set extact to point to bad
>attribute on error.
>
>Signed-off-by: Jakub Kicinski <jakub.kicinski@...ronome.com>
>Acked-by: Simon Horman <simon.horman@...ronome.com>

Fixes: 0a6e77784f49 ("net/sched: allow flower to match tunnel options")
Acked-by: Jiri Pirko <jiri@...lanox.com>