netdev - Re: [PATCH] ipv6: check raw payload size correctly in ioctl

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Message-Id: <20170426.150004.494655279490216482.davem@davemloft.net>
Date:   Wed, 26 Apr 2017 15:00:04 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     jbainbri@...hat.com
Cc:     kuznet@....inr.ac.ru, jmorris@...ei.org, yoshfuji@...ux-ipv6.org,
        kaber@...sh.net, netdev@...r.kernel.org
Subject: Re: [PATCH] ipv6: check raw payload size correctly in ioctl

From: Jamie Bainbridge <jbainbri@...hat.com>
Date: Wed, 26 Apr 2017 10:43:27 +1000

> In situations where an skb is paged, the transport header pointer and
> tail pointer can be the same because the skb contents are in frags.
> 
> This results in ioctl(SIOCINQ/FIONREAD) incorrectly returning a
> length of 0 when the length to receive is actually greater than zero.
> 
> skb->len is already correctly set in ip6_input_finish() with
> pskb_pull(), so use skb->len as it always returns the correct result
> for both linear and paged data.
> 
> Signed-off-by: Jamie Bainbridge <jbainbri@...hat.com>

Applied and queued up for -stable, thanks.