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HID: bigben: use spinlock to safely schedule workers

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Use spinlocks to deal with workers introducing a wrapper
bigben_schedule_work(), and several spinlock checks.
Otherwise, bigben_set_led() may schedule bigben->worker after the
structure has been freed, causing a use-after-free.

Fixes: 4eb1b01de5 ("HID: hid-bigbenff: fix race condition for scheduled work during removal")
Signed-off-by: Pietro Borrello <borrello@diag.uniroma1.it>
Link: https://lore.kernel.org/r/20230125-hid-unregister-leds-v4-3-7860c5763c38@diag.uniroma1.it
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
This commit is contained in:
Pietro Borrello 2023-02-12 19:00:01 +00:00 committed by Benjamin Tissoires
parent 27d2a2fd84
commit 76ca8da989
1 changed files with 12 additions and 6 deletions
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18
drivers/hid/hid-bigbenff.c
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@ -185,6 +185,15 @@ struct bigben_device {
struct work_struct worker;
};
static inline void bigben_schedule_work(struct bigben_device *bigben)
{
unsigned long flags;
spin_lock_irqsave(&bigben->lock, flags);
if (!bigben->removed)
schedule_work(&bigben->worker);
spin_unlock_irqrestore(&bigben->lock, flags);
}
static void bigben_worker(struct work_struct *work)
{
@ -197,9 +206,6 @@ static void bigben_worker(struct work_struct *work)
u32 len;
unsigned long flags;
if (bigben->removed)
return;
buf = hid_alloc_report_buf(bigben->report, GFP_KERNEL);
if (!buf)
return;
@ -285,7 +291,7 @@ static int hid_bigben_play_effect(struct input_dev *dev, void *data,
bigben->work_ff = true;
spin_unlock_irqrestore(&bigben->lock, flags);
schedule_work(&bigben->worker);
bigben_schedule_work(bigben);
}
return 0;
@ -320,7 +326,7 @@ static void bigben_set_led(struct led_classdev *led,
if (work) {
bigben->work_led = true;
schedule_work(&bigben->worker);
bigben_schedule_work(bigben);
}
return;
}
@ -450,7 +456,7 @@ static int bigben_probe(struct hid_device *hid,
bigben->left_motor_force = 0;
bigben->work_led = true;
bigben->work_ff = true;
schedule_work(&bigben->worker);
bigben_schedule_work(bigben);
hid_info(hid, "LED and force feedback support for BigBen gamepad\n");