netdev - Re: [PATCH net-next 1/2 v2] net sched actions: dump more than TCA_ACT_MAX

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Date:   Wed, 19 Apr 2017 11:43:42 -0400
From:   Jamal Hadi Salim <jhs@...atatu.com>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     davem@...emloft.net, netdev@...r.kernel.org, jiri@...nulli.us,
        xiyou.wangcong@...il.com
Subject: Re: [PATCH net-next 1/2 v2] net sched actions: dump more than
 TCA_ACT_MAX_PRIO actions per batch

On 17-04-19 09:47 AM, Eric Dumazet wrote:

> Try to _not_ use 32768 bytes for the recvmsg() sizes, but 4KB
>
> You pack XXX actions until 4KB skb is full.
>
> Then code does :
>
> nla_put_u32(skb, TCAA_ACT_COUNT, cb->args[1])
>
> This might fail, then you
>
> goto out_module_put;
>
>
> Then we are stuck ?
>
> What am I missing ?
>
>

Ok, I understand you now ;->
You are saying we need make sure there is at
least 64 bits reserved so we can stick this TLV in there.
We may have to review a lot of other dumping code in general
to make sure this doesnt happen. Thanks Eric.

cheers,
jamal