netdev - Re: [net PATCH] fib_trie: Correct /proc/net/route off by one error

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Date:   Mon, 07 Nov 2016 20:41:01 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     alexander.h.duyck@...el.com
Cc:     netdev@...r.kernel.org, alexander.duyck@...il.com,
        apw@...onical.com, jbaron@...mai.com
Subject: Re: [net PATCH] fib_trie: Correct /proc/net/route off by one error

From: Alexander Duyck <alexander.h.duyck@...el.com>
Date: Fri, 04 Nov 2016 15:11:57 -0400

> The display of /proc/net/route has had a couple issues due to the fact that
> when I originally rewrote most of fib_trie I made it so that the iterator
> was tracking the next value to use instead of the current.
> 
> In addition it had an off by 1 error where I was tracking the first piece
> of data as position 0, even though in reality that belonged to the
> SEQ_START_TOKEN.
> 
> This patch updates the code so the iterator tracks the last reported
> position and key instead of the next expected position and key.  In
> addition it shifts things so that all of the leaves start at 1 instead of
> trying to report leaves starting with offset 0 as being valid.  With these
> two issues addressed this should resolve any off by one errors that were
> present in the display of /proc/net/route.
> 
> Fixes: 25b97c016b26 ("ipv4: off-by-one in continuation handling in /proc/net/route")
> Cc: Andy Whitcroft <apw@...onical.com>
> Reported-by: Jason Baron <jbaron@...mai.com>
> Signed-off-by: Alexander Duyck <alexander.h.duyck@...el.com>

Applied and queued up for -stable.