netdev - Re: [PATCH] fib_trie: remove potential out of bound access

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Message-Id: <20130805.152701.1330956846335649347.davem@davemloft.net>
Date:	Mon, 05 Aug 2013 15:27:01 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	netdev@...r.kernel.org, andreyknvl@...gle.com, dvyukov@...gle.com
Subject: Re: [PATCH] fib_trie: remove potential out of bound access

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Mon, 05 Aug 2013 11:18:49 -0700

> From: Eric Dumazet <edumazet@...gle.com>
> 
> AddressSanitizer [1] dynamic checker pointed a potential
> out of bound access in leaf_walk_rcu()
> 
> We could allocate one more slot in tnode_new() to leave the prefetch()
> in-place but it looks not worth the pain.
> 
> Bug added in commit 82cfbb008572b ("[IPV4] fib_trie: iterator recode")
> 
> [1] :
> https://code.google.com/p/address-sanitizer/wiki/AddressSanitizerForKernel
> 
> Reported-by: Andrey Konovalov <andreyknvl@...gle.com>
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

I question the validity of the prefetch anyways, even without the
out-of-bounds concerns.

Applied and queued up for -stable, thanks Eric.
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