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

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Message-ID: <CADVnQymL5ns=N8iQHZSvPitbbTpatnWTgPs+M0QxpiyL9FJ5Ug@mail.gmail.com>
Date:	Tue, 22 Jul 2014 17:58:40 -0400
From:	Neal Cardwell <ncardwell@...gle.com>
To:	Christoph Paasch <christoph.paasch@...ouvain.be>
Cc:	David Miller <davem@...emloft.net>,
	Netdev <netdev@...r.kernel.org>, Doug Leith <doug.leith@...m.ie>
Subject: Re: [PATCH net] tcp: Fix integer-overflows in TCP vegas

On Tue, Jul 22, 2014 at 5:36 PM, Christoph Paasch
<christoph.paasch@...ouvain.be> wrote:
> In vegas 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.
>
> Cc: Doug Leith <doug.leith@...m.ie>
> Fixes: 8d3a564da34e (tcp: tcp_vegas cong avoid fix)
> Signed-off-by: Christoph Paasch <christoph.paasch@...ouvain.be>
> ---
>  net/ipv4/tcp_vegas.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Acked-by: Neal Cardwell <ncardwell@...gle.com>

Thanks!

neal
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