linux-kernel - [PATCH 1/2] input - leds: do not iterate over non initialized leds

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Date:   Thu, 14 Dec 2017 14:25:21 +0100
From:   Benjamin Tissoires <benjamin.tissoires@...hat.com>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Samuel Thibault <samuel.thibault@...-lyon.org>,
        Peter Hutterer <peter.hutterer@...-t.net>
Cc:     linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        stable@...r.kernel.org
Subject: [PATCH 1/2] input - leds: do not iterate over non initialized leds

We only instantiate the led classes if there is a definition in
input_led_info[].
However, the max for EV_LED is bigger than the values filled in this
array, and there are some holes in it.

In .connect(), we check for these holes, but in leds_init_work() we do
not, leading to some nice kernel oopses.

Found by running https://github.com/whot/fuzzydevice

Cc: stable@...r.kernel.org
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>
---
 drivers/input/input-leds.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/input/input-leds.c b/drivers/input/input-leds.c
index 83d930f7396a..c86eb3d648bf 100644
--- a/drivers/input/input-leds.c
+++ b/drivers/input/input-leds.c
@@ -94,6 +94,9 @@ static void leds_init_work(struct work_struct *work)
 	int led_no = 0;
 
 	for_each_set_bit(led_code, leds->handle.dev->ledbit, LED_CNT) {
+		if (!input_led_info[led_code].name)
+			continue;
+
 		led = &leds->leds[led_no];
 
 		down_read(&led->cdev.trigger_lock);
-- 
2.14.3