From: Pietro Borrello Date: Sun, 12 Feb 2023 19:00:03 +0000 (+0000) Subject: HID: asus: use spinlock to safely schedule workers X-Git-Tag: v4.14.308~179 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=df0fad94ca3787727b9cdd76797aaacf46fe93ed;p=thirdparty%2Fkernel%2Fstable.git HID: asus: use spinlock to safely schedule workers commit 4ab3a086d10eeec1424f2e8a968827a6336203df upstream. Use spinlocks to deal with workers introducing a wrapper asus_schedule_work(), and several spinlock checks. Otherwise, asus_kbd_backlight_set() may schedule led->work after the structure has been freed, causing a use-after-free. Fixes: af22a610bc38 ("HID: asus: support backlight on USB keyboards") Signed-off-by: Pietro Borrello Link: https://lore.kernel.org/r/20230125-hid-unregister-leds-v4-5-7860c5763c38@diag.uniroma1.it Signed-off-by: Benjamin Tissoires Signed-off-by: Stefan Ghinea Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/hid/hid-asus.c b/drivers/hid/hid-asus.c index a4bcf18ab18a8..7cdbde2b114b3 100644 --- a/drivers/hid/hid-asus.c +++ b/drivers/hid/hid-asus.c @@ -294,6 +294,16 @@ static int asus_kbd_get_functions(struct hid_device *hdev, return ret; } +static void asus_schedule_work(struct asus_kbd_leds *led) +{ + unsigned long flags; + + spin_lock_irqsave(&led->lock, flags); + if (!led->removed) + schedule_work(&led->work); + spin_unlock_irqrestore(&led->lock, flags); +} + static void asus_kbd_backlight_set(struct led_classdev *led_cdev, enum led_brightness brightness) { @@ -305,7 +315,7 @@ static void asus_kbd_backlight_set(struct led_classdev *led_cdev, led->brightness = brightness; spin_unlock_irqrestore(&led->lock, flags); - schedule_work(&led->work); + asus_schedule_work(led); } static enum led_brightness asus_kbd_backlight_get(struct led_classdev *led_cdev) @@ -329,9 +339,6 @@ static void asus_kbd_backlight_work(struct work_struct *work) int ret; unsigned long flags; - if (led->removed) - return; - spin_lock_irqsave(&led->lock, flags); buf[4] = led->brightness; spin_unlock_irqrestore(&led->lock, flags);