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| author | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2018-04-06 20:23:05 +0300 |
|---|---|---|
| committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2018-04-12 00:52:59 +0300 |
| commit | 6bd6ae639683c0b41f46990d5c64ff9fbfa019dc (patch) | |
| tree | 6c6b208922fdf50ddddf3e072048d6e07cb2fa5a /drivers/input/input-leds.c | |
| parent | 839c42273617787318da7baf6151d553108f5e17 (diff) | |
| download | linux-6bd6ae639683c0b41f46990d5c64ff9fbfa019dc.tar.xz | |
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 <tasos@tasossah.com>
Tested-by: Tasos Sahanidis <tasos@tasossah.com>
Cc: stable@vger.kernel.org
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Diffstat (limited to 'drivers/input/input-leds.c')
| -rw-r--r-- | drivers/input/input-leds.c | 8 |
1 files changed, 4 insertions, 4 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]; + 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); |