netdev - Re: [PATCH net-next v5 1/2] net sched actions: dump more than TCA_ACT_MAX

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Date:   Thu, 20 Apr 2017 09:09:58 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Jamal Hadi Salim <jhs@...atatu.com>
Cc:     davem@...emloft.net, jiri@...nulli.us, xiyou.wangcong@...il.com,
        netdev@...r.kernel.org
Subject: Re: [PATCH net-next v5 1/2] net sched actions: dump more than
 TCA_ACT_MAX_PRIO actions per batch

On Thu, 2017-04-20 at 09:06 -0400, Jamal Hadi Salim wrote:

>  	nest = nla_nest_start(skb, TCA_ACT_TAB);
>  	if (nest == NULL)
> @@ -1113,6 +1136,8 @@ static int tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
>  	if (ret > 0) {
>  		nla_nest_end(skb, nest);
>  		ret = skb->len;
> +		memcpy(nla_data(count_attr), &cb->args[1], sizeof(u32));

This will not work on BigEndian 64bit hosts, since cb->args[1] is bigger
than 32bit.


> +		cb->args[1] = 0;
>  	} else
>  		nlmsg_trim(skb, b);
>