netdev - Re: [PATCH net,stable-4.0] cdc_ncm: Fix tx

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Message-Id: <20150522.143421.442426385899149301.davem@davemloft.net>
Date:	Fri, 22 May 2015 14:34:21 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	bjorn@...k.no
Cc:	netdev@...r.kernel.org, me@...-compiler.org,
	linux-usb@...r.kernel.org, oliver@...kum.org,
	ben.hutchings@...ethink.co.uk
Subject: Re: [PATCH net,stable-4.0] cdc_ncm: Fix tx_bytes statistics

From: Bjørn Mork <bjorn@...k.no>
Date: Fri, 22 May 2015 13:15:22 +0200

> The tx_curr_frame_payload field is u32. When we try to calculate a
> small negative delta based on it, we end up with a positive integer
> close to 2^32 instead.  So the tx_bytes pointer increases by about
> 2^32 for every transmitted frame.
> 
> Fix by calculating the delta as a signed long.
> 
> Cc: Ben Hutchings <ben.hutchings@...ethink.co.uk>
> Reported-by: Florian Bruhin <me@...-compiler.org>
> Fixes: 7a1e890e2168 ("usbnet: Fix tx_bytes statistic running backward in cdc_ncm")
> Signed-off-by: Bjørn Mork <bjorn@...k.no>

Applied and queued up for -stable.
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