From c945cbcf453cb72dc2287fc4f7b63314f173b313 Mon Sep 17 00:00:00 2001
From: Manfred Schlaegl <manfred.schlaegl@gmx.at>
Date: Tue, 13 Aug 2013 04:17:05 -0700
Subject: [PATCH] leds: trigger: ledtrig-backlight: Fix invalid memory access
 in fb_event notification callback

fb_notifier_callback is called on any event fired by
fb_notifier_call_chain. Events may, or may not contain some data
(fb_event.data). In case of FB_EVENT_BLANK fb_event.data contains a
pointer to an integer holdingthe blank state. The Problem is, that in
ledtrig-backlight.c - fb_notifier_callback the pointer to blank state
is dereferenced BEFORE the event-type is checked.

Obviously this leads to problems with other events than FB_EVENT_BLANK,
where fb_event.data is undefined or NULL. It seems, that this problem
existed ever since the driver was added.

Like in drivers/video/backlight/backlight.c line 43 I would suggest to
return immediately on events other than FB_EVENT_BLANK.

Signed-off-by: Manfred Schlaegl <manfred.schlaegl@gmx.at>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
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