diff options
| author | Pietro Borrello <borrello@diag.uniroma1.it> | 2023-02-12 19:00:03 +0000 |
|---|---|---|
| committer | Benjamin Tissoires <benjamin.tissoires@redhat.com> | 2023-02-15 18:20:56 +0100 |
| commit | 4ab3a086d10eeec1424f2e8a968827a6336203df (patch) | |
| tree | 748e3e98df2c98c9d24c05cc3384bd4fa2b55c93 /drivers/hid | |
| parent | 315c537068a13f0b5681d33dd045a912f4bece6f (diff) | |
HID: asus: use spinlock to safely schedule workers
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 <borrello@diag.uniroma1.it>
Link: https://lore.kernel.org/r/20230125-hid-unregister-leds-v4-5-7860c5763c38@diag.uniroma1.it
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Diffstat (limited to 'drivers/hid')
| -rw-r--r-- | drivers/hid/hid-asus.c | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/drivers/hid/hid-asus.c b/drivers/hid/hid-asus.c index 9f767baf39fb..d1094bb1aa42 100644 --- a/drivers/hid/hid-asus.c +++ b/drivers/hid/hid-asus.c @@ -491,6 +491,16 @@ static int rog_nkey_led_init(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) { @@ -502,7 +512,7 @@ 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) @@ -526,9 +536,6 @@ 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); |