From 6bd6ae639683c0b41f46990d5c64ff9fbfa019dc Mon Sep 17 00:00:00 2001 From: Dmitry Torokhov Date: Fri, 6 Apr 2018 10:23:05 -0700 Subject: [PATCH] Input: leds - fix out of bound access 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 Tested-by: Tasos Sahanidis Cc: stable@vger.kernel.org Signed-off-by: Dmitry Torokhov --- drivers/input/input-leds.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/drivers/input/input-leds.c b/drivers/input/input-leds.c index 766bf2660116..5f04b2d94635 100644 --- a/drivers/input/input-leds.c +++ b/drivers/input/input-leds.c @@ -88,6 +88,7 @@ static int input_leds_connect(struct input_handler *handler, 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 input_handler *handler, led_no = 0; for_each_set_bit(led_code, dev->ledbit, LED_CNT) { - struct input_led *led = &leds->leds[led_no]; - - led->handle = &leds->handle; - led->code = led_code; - if (!input_led_info[led_code].name) continue; + led = &leds->leds[led_no]; + led->handle = &leds->handle; + led->code = led_code; + led->cdev.name = kasprintf(GFP_KERNEL, "%s::%s", dev_name(&dev->dev), input_led_info[led_code].name);