netdev - RE: [RFC PATCH] rtnetlink: Fix problem with buffer allocation

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Message-ID: <C5551D9AAB213A418B7FD5E4A6F30A0702F88D50@ORSMSX106.amr.corp.intel.com>
Date:	Fri, 10 Feb 2012 19:30:20 +0000
From:	"Rose, Gregory V" <gregory.v.rose@...el.com>
To:	David Miller <davem@...emloft.net>
CC:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [RFC PATCH] rtnetlink: Fix problem with buffer allocation

> -----Original Message-----
> From: David Miller [mailto:davem@...emloft.net]
> Sent: Friday, February 10, 2012 11:25 AM
> To: Rose, Gregory V
> Cc: netdev@...r.kernel.org
> Subject: Re: [RFC PATCH] rtnetlink: Fix problem with buffer allocation
> 
> From: "Rose, Gregory V" <gregory.v.rose@...el.com>
> Date: Fri, 10 Feb 2012 19:07:15 +0000
> 
> > OK, sounds good.  How about I also add a field to indicate the
> > application buffer size?
> 
> How can this help, we already have it.  It's the length field to
> the recvmsg() call.

Ah, I hadn't seen that.

Ok.

- Greg

> 
> Also, either the user provided a large enough buffer or he didn't.  If
> he didn't we return an error to the recvmsg() call, and the user can
> increase the buffer size and try again.

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