netdev - Re: [PATCH net-next v11 3/4] net sched actions: dump more than TCA_ACT_MAX

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Date:   Fri, 28 Jul 2017 11:08:10 -0400
From:   Jamal Hadi Salim <jhs@...atatu.com>
To:     Jiri Pirko <jiri@...nulli.us>
Cc:     davem@...emloft.net, netdev@...r.kernel.org,
        xiyou.wangcong@...il.com, dsahern@...il.com,
        eric.dumazet@...il.com, mrv@...atatu.com,
        simon.horman@...ronome.com, alex.aring@...il.com
Subject: Re: [PATCH net-next v11 3/4] net sched actions: dump more than
 TCA_ACT_MAX_PRIO actions per batch

On 17-07-28 10:52 AM, Jamal Hadi Salim wrote:
> On 17-07-28 10:12 AM, Jiri Pirko wrote:
>> Fri, Jul 28, 2017 at 03:41:44PM CEST, jhs@...atatu.com wrote:
> [..]
>>
>> Looks like a big mess to be honest. Mixing up u32* u32 void*. I don't
>> understand ****. Would be probably good to first apply my review comment
>> on the function itselt, then to add the checks :)
>>
> 
> I havent even compiled/test that Jiri.
> Just ignore the void * and assume it is a u32 *.
> 

This compiled - but dont have much time right now to test.
===
static int validate_nla_bitfield32(const struct nlattr *nla,
                                    u32 *valid_flags_allowed)
{
         const struct nla_bitfield32 *bf = nla_data(nla);
         u32 *valid_flags_mask = valid_flags_allowed;

         if (!valid_flags_allowed)
                 return -EINVAL;

         /*disallow invalid selector */
         if ((bf->selector & *valid_flags_allowed) > *valid_flags_allowed)
                 return -EINVAL;

         /*disallow invalid bit values */
         if (bf->value & ~*valid_flags_mask)
                 return -EINVAL;

         /*disallow valid bit values that are not selected*/
         if (bf->value & ~bf->selector)
                 return -EINVAL;

         return 0;
}
========

cheers,
jamal