netdev - Re: [PATCH 2/7] sock_diag: Do not use RTA

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Date:	Wed, 27 Jun 2012 06:07:43 -0400
From:	Thomas Graf <tgraf@...g.ch>
To:	David Laight <David.Laight@...LAB.COM>
Cc:	davem@...emloft.net, netdev@...r.kernel.org
Subject: Re: [PATCH 2/7] sock_diag: Do not use RTA_PUT() macros

On Wed, Jun 27, 2012 at 11:00:30AM +0100, David Laight wrote:
>  
> > @@ -35,9 +34,7 @@ EXPORT_SYMBOL_GPL(sock_diag_save_cookie);
> >  
> >  int sock_diag_put_meminfo(struct sock *sk, struct sk_buff 
> > *skb, int attrtype)
> >  {
> > -	__u32 *mem;
> > -
> > -	mem = RTA_DATA(__RTA_PUT(skb, attrtype, SK_MEMINFO_VARS *
> sizeof(__u32)));
> > +	u32 mem[SK_MEMINFO_VARS];
> 
> Isn't that likely to blow the kernel stack?

SK_MEMINFO_VARS = 8, so no. I can change it to use nla_reserve()
if wasting 32 bytes on the stack is an issue.
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