HID: hid-lenovo-go: cancel cfg_setup work in hid_go_cfg_remove()

hid_go_cfg_probe() initialises drvdata.go_cfg_setup and schedules it
to run 2 ms later:

    INIT_DELAYED_WORK(&drvdata.go_cfg_setup, &cfg_setup);
    schedule_delayed_work(&drvdata.go_cfg_setup, msecs_to_jiffies(2));

cfg_setup() dereferences drvdata.hdev to issue MCU command requests.
hid_go_cfg_remove() tears down sysfs and stops the HID device, but
never drains the delayed work.  If the device is unbound within the
2 ms scheduling delay (a probe failure rolling back via remove, or a
fast rmmod after probe), the work fires after hid_destroy_device()
has dropped its reference and released the underlying hdev struct,
leaving cfg_setup() with a stale drvdata.hdev pointer.

Mirror the sibling driver hid-lenovo-go-s.c, whose hid_gos_cfg_remove()
already calls cancel_delayed_work_sync() on its analogous work, and
drain go_cfg_setup at the top of hid_go_cfg_remove().  The cancel
must come before guard(mutex)(&drvdata.cfg_mutex) because cfg_setup()
acquires that mutex; reversing the order would deadlock.

Fixes: d69ccfcbc955 ("HID: hid-lenovo-go: Add Lenovo Legion Go Series HID Driver")
Cc: stable@vger.kernel.org
Signed-off-by: Manish Khadka <maskmemanish@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/hid/hid-lenovo-go.c b/drivers/hid/hid-lenovo-go.c
index e0c9d5ec9451..318b1152ff8b 100644
--- a/drivers/hid/hid-lenovo-go.c
+++ b/drivers/hid/hid-lenovo-go.c
@@ -2405,6 +2405,15 @@ static int hid_go_cfg_probe(struct hid_device *hdev,
 
 static void hid_go_cfg_remove(struct hid_device *hdev)
 {
+	/*
+	 * cfg_setup is scheduled from hid_go_cfg_probe() with a 2 ms delay
+	 * and dereferences drvdata.hdev.  Drain it here before tearing
+	 * down so the workqueue cannot run after hid_destroy_device()'s
+	 * put_device() has released the underlying hdev and dereference
+	 * a stale drvdata.hdev pointer.
+	 */
+	cancel_delayed_work_sync(&drvdata.go_cfg_setup);
+
 	guard(mutex)(&drvdata.cfg_mutex);
 	sysfs_remove_groups(&hdev->dev.kobj, top_level_attr_groups);
 	hid_hw_close(hdev);