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

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Date:	Mon, 08 Mar 2010 08:41:57 +0100
From:	Johannes Berg <johannes@...solutions.net>
To:	Vadim Zaliva <lord@...codile.org>
Cc:	linux-kernel@...r.kernel.org,
	Dmitry Torokhov <dmitry.torokhov@...il.com>
Subject: Re: [PATCH 1/1] integer overflow issue in 'appletouch' driver

On Fri, 2010-03-05 at 11:47 -0800, Vadim Zaliva wrote:
> This small patch is fixing an integer overflow issue in 'appletouch' driver.
> 
> In particular, reading data from Geyser 2 touchpads used on post Oct
> 2005 Apple PowerBooks the driver was casting X and Y coordinates
> values to 'signed char'. 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.
> 
> Such bigger values have been observed infrequently, closer to the
> edges of a touchpad, so the problem was not very visible. 
> Nevertheless, the patch would potentially improve touchpad
> driver accuracy.

Hmm, you're probably right, and I cannot test with my powerbook as I'm
about to leave on travel and it's at my parents.

johannes

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