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Subject[PATCH 4.14 15/43] Input: leds - fix out of bound access
Date
4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Dmitry Torokhov <dmitry.torokhov@gmail.com>

commit 6bd6ae639683c0b41f46990d5c64ff9fbfa019dc upstream.

UI_SET_LEDBIT ioctl() causes the following KASAN splat when used with
led > LED_CHARGING:

[ 1274.663418] BUG: KASAN: slab-out-of-bounds in input_leds_connect+0x611/0x730 [input_leds]
[ 1274.663426] Write of size 8 at addr ffff88003377b2c0 by task ckb-next-daemon/5128

This happens because we were writing to the led structure before making
sure that it exists.

Reported-by: Tasos Sahanidis <tasos@tasossah.com>
Tested-by: Tasos Sahanidis <tasos@tasossah.com>
Cc: stable@vger.kernel.org
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/input/input-leds.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)

--- a/drivers/input/input-leds.c
+++ b/drivers/input/input-leds.c
@@ -88,6 +88,7 @@ static int input_leds_connect(struct inp
const struct input_device_id *id)
{
struct input_leds *leds;
+ struct input_led *led;
unsigned int num_leds;
unsigned int led_code;
int led_no;
@@ -119,14 +120,13 @@ static int input_leds_connect(struct inp

led_no = 0;
for_each_set_bit(led_code, dev->ledbit, LED_CNT) {
- struct input_led *led = &leds->leds[led_no];
+ if (!input_led_info[led_code].name)
+ continue;

+ led = &leds->leds[led_no];
led->handle = &leds->handle;
led->code = led_code;

- if (!input_led_info[led_code].name)
- continue;
-
led->cdev.name = kasprintf(GFP_KERNEL, "%s::%s",
dev_name(&dev->dev),
input_led_info[led_code].name);

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