Re: [PATCH net-next 3/4] ethtool: strset: check nla_len overflow before nla_nest_end

[Hangbin Liu <liuhangbin@gmail.com>]

On Tue, Mar 31, 2026 at 06:46:37PM -0700, Jakub Kicinski wrote:
> On Tue, 31 Mar 2026 11:56:13 +0800 Hangbin Liu wrote:
> > +		if (skb_tail_pointer(skb) - (unsigned char *)strings_attr > U16_MAX)
> > +			goto nla_put_failure;
> 
> bit ugly, let's add a variant of nla_nest_end() which can return 
> an error on overflow (without the warning from patch 4) ?

I was tried to not touch nla_nest_end() as it is used everywhere. But it makes
sense to me to add a new function to check this. I'm not very good at naming,
maybe `nla_nest_end_validate()` ? Or any other name if you have?

Thanks
Hangbin
> 
> > +
> >  		nla_nest_end(skb, strings_attr);