netdev - Re: [PATCH v3 net-next] tcp: avoid possible arithmetic overflows

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Message-Id: <20140922.162703.824025819934075774.davem@davemloft.net>
Date:	Mon, 22 Sep 2014 16:27:03 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	ycheng@...gle.com, joe@...ches.com, netdev@...r.kernel.org,
	ncardwell@...gle.com
Subject: Re: [PATCH v3 net-next] tcp: avoid possible arithmetic overflows

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Mon, 22 Sep 2014 13:19:44 -0700

> From: Eric Dumazet <edumazet@...gle.com>
> 
> icsk_rto is a 32bit field, and icsk_backoff can reach 15 by default,
> or more if some sysctl (eg tcp_retries2) are changed.
> 
> Better use 64bit to perform icsk_rto << icsk_backoff operations
> 
> As Joe Perches suggested, add a helper for this.
> 
> Yuchung spotted the tcp_v4_err() case.
> 
> From: Eric Dumazet <edumazet@...gle.com>

I assume you meant "Signed-off-by: " on that last line, not "From: " :-)

Applied,
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