linux-kernel - RE: [PATCH v6 1/5] skbuff: return -EMSGSIZE in skb_to

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Date:   Thu, 27 Apr 2017 14:54:14 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     "'Jason A. Donenfeld'" <Jason@...c4.com>,
        Sabrina Dubroca <sd@...asysnail.net>
CC:     Netdev <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        "kernel-hardening@...ts.openwall.com" 
        <kernel-hardening@...ts.openwall.com>,
        David Miller <davem@...emloft.net>
Subject: RE: [PATCH v6 1/5] skbuff: return -EMSGSIZE in skb_to_sgvec to
 prevent overflow

From: Jason A. Donenfeld
> On Thu, Apr 27, 2017 at 1:30 PM, Sabrina Dubroca <sd@...asysnail.net> wrote:
> > Hmm, I think this can actually happen:
> 
> Alright, perhaps better to err on the side of caution, then.

You only need to recurse if both pointers are set.

	David