Re: [PATCH net,stable-4.0] cdc_ncm: Fix tx_bytes statistics

From: Bjørn Mork <redacted>
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 <redacted>
Reported-by: Florian Bruhin <redacted>
Fixes: 7a1e890e2168 ("usbnet: Fix tx_bytes statistic running backward in cdc_ncm")
Signed-off-by: Bjørn Mork <redacted>

Applied and queued up for -stable.
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