netdev - Re: [PATCH net-next v5] rtnetlink: add new RTM

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Date:	Mon, 18 Apr 2016 20:57:55 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	roopa@...ulusnetworks.com, netdev@...r.kernel.org,
	jhs@...atatu.com, tgraf@...g.ch, nicolas.dichtel@...nd.com
Subject: Re: [PATCH net-next v5] rtnetlink: add new RTM_GETSTATS message to
 dump link stats

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Mon, 18 Apr 2016 14:35:56 -0700

> On Mon, 2016-04-18 at 14:10 -0700, Roopa Prabhu wrote:
> 
>> +	if (filter_mask & IFLA_STATS_FILTER_BIT(IFLA_STATS_LINK_64)) {
>> +		struct rtnl_link_stats64 *sp;
>> +
>> +		attr = nla_reserve(skb, IFLA_STATS_LINK_64,
>> +				   sizeof(struct rtnl_link_stats64));
>> +		if (!attr)
>> +			goto nla_put_failure;
>> +
>> +		sp = nla_data(attr);
> 
> Are you sure we have a guarantee that sp is aligned to u64 fields ?
> 
> x86 does not care, but some arches would have a potential misalign
> access here.

I'll do some testing on sparc and deal with any fallout.