From: Daniel Vetter <daniel.vetter@ffwll.ch>
Date: Sat, 5 Apr 2014 16:24:29 +0000 (+0200)
Subject: drm/i2c/tda998x: Fix signed overflow issue
X-Git-Tag: omap-for-v3.16/fixes-against-rc1~44^2~60^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8268bd48af9aae5e079d3ba8403ae459ff06cbcb;p=pandora-kernel.git

drm/i2c/tda998x: Fix signed overflow issue

This is C standard hair-splitting, but afaict
- sum will be promoted to signed int in computation since
  uint8_t fits
- signed overflow is undefined.

No we need to add up an awful lot of bytes to actually make it
overflow. But I guess the real risk is gcc spotting this and going
bananas. Fix this by simply using unsigned in to force all computations
to use the well-defined unsigned behaviour.

Spotted by coverity.

v2: Simplify the entire computation as suggested by Jean.

Cc: Russell King <rmk+kernel@arm.linux.org.uk>
Cc: Rob Clark <robdclark@gmail.com>
Cc: Jean-Francois Moine <moinejf@free.fr>
Reviewed-by: David Herrmann <dh.herrmann@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---

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