netdev - Re: [PATCH RESUBMIT net] tcp: Fix integer-overflows in TCP veno

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Message-Id: <20140730.173134.865256818780740961.davem@davemloft.net>
Date:	Wed, 30 Jul 2014 17:31:34 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	christoph.paasch@...ouvain.be
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH RESUBMIT net] tcp: Fix integer-overflows in TCP veno

From: Christoph Paasch <christoph.paasch@...ouvain.be>
Date: Tue, 29 Jul 2014 12:07:27 +0200

> In veno we do a multiplication of the cwnd and the rtt. This
> may overflow and thus their result is stored in a u64. However, we first
> need to cast the cwnd so that actually 64-bit arithmetic is done.
> 
> A first attempt at fixing 76f1017757aa0 ([TCP]: TCP Veno congestion
> control) was made by 159131149c2 (tcp: Overflow bug in Vegas), but it
> failed to add the required cast in tcp_veno_cong_avoid().
> 
> Fixes: 76f1017757aa0 ([TCP]: TCP Veno congestion control)
> Signed-off-by: Christoph Paasch <christoph.paasch@...ouvain.be>

Applied and queued up for -stable.
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