cdc_ncm: Fix tx_bytes statistics

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commit 44f6731d8b upstream.

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@codethink.co.uk>
Reported-by: Florian Bruhin <me@the-compiler.org>
Fixes: 7a1e890e21 ("usbnet: Fix tx_bytes statistic running backward in cdc_ncm")
Signed-off-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>

...

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Bjørn Mork 2015-05-22 13:15:22 +02:00 • committed by Luis Henriques

parent 9ccba705cd

commit 7baba68a6a

1 changed files with 1 additions and 1 deletions

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drivers/net/usb/cdc_ncm.c

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