linux-kernel - Re: [PATCH 1/1] integer overflow issue in 'appletouch' driver

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Date:	Sat, 07 Aug 2010 14:00:10 +0000
From:	Serge Belyshev <belyshev@...ni.sinp.msu.ru>
To:	Vadim Zaliva <lord@...codile.org>
Cc:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Johannes Berg <johannes@...solutions.net>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] integer overflow issue in 'appletouch' driver

Hi!

Since 2.6.34 the touchpad on my feb 2005 powerbook (mod. A1106) has
stopped working. I've identified the following guilty patch:

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=04b4b88cca0ebe3813b4b6f014fb6a0db380b137

> ... Testing on one of such PowerBooks I have
> noticed that touchpad always generates positive values, but some of
> them are greater that 127, and thus, when cast to 'signed char' being
> interpreted as a negative.

My device is 05ac:020e "fountain", actually generates *signed* values,
thus the patch completely breaks it.
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