netdev - Re: [PATCH net-next 2/2 v2] net sched actions: add time filter for action dumping

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Date:   Tue, 18 Apr 2017 18:35:38 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Jamal Hadi Salim <jhs@...atatu.com>
Cc:     davem@...emloft.net, netdev@...r.kernel.org, jiri@...nulli.us,
        xiyou.wangcong@...il.com
Subject: Re: [PATCH net-next 2/2 v2] net sched actions: add time filter for
 action dumping

On Tue, 2017-04-18 at 21:14 -0400, Jamal Hadi Salim wrote:
> From: Jamal Hadi Salim <jhs@...atatu.com>
> 

> +	if (tcaa[TCAA_ACT_TIME_FILTER])
> +		msecs_filter = nla_get_u32(tcaa[TCAA_ACT_TIME_FILTER]);


You forgot to add TCAA_ACT_TIME_FILTER in tcaa_policy

There is no guarantee user passed 32bit data here.

> +
>  	nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
>  			cb->nlh->nlmsg_type, sizeof(*t), 0);
>  	if (!nlh)
>  		goto out_module_put;
>  
> +	if (msecs_filter) {
> +		unsigned long jiffy_msecs = msecs_to_jiffies(msecs_filter);
> +		jiffy_wanted = jiffies - jiffy_msecs;
> +	}
> +
>  	cb->args[2] = act_flags;
> +	cb->args[3] = jiffy_wanted;
>  
>  	t = nlmsg_data(nlh);
>  	t->tca_family = AF_UNSPEC;