[PATCH 3/4] hwmon: (nzxt-smart2) Stop device IO before calling hid_hw_stop

[Guenter Roeck <linux@roeck-us.net>]

Calling hid_hw_stop() does not stop the device IO.
This results in a race condition between hid_input_report() and the point
immediately following the execution of hid_device_io_start() within
the driver probe function. If the probe operation fails after "io start"
has been initiated, this race condition will result in a UAF vulnerability.

Fix the problem by calling hid_device_io_stop() before calling
hid_hw_stop().

Reported-by: Sashiko <sashiko-bot@kernel.org>
Fixes: 53e68c20aeb1e ("hwmon: add driver for NZXT RGB&Fan Controller/Smart Device v2")
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
---
 drivers/hwmon/nzxt-smart2.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/hwmon/nzxt-smart2.c b/drivers/hwmon/nzxt-smart2.c
index 58ef9fa0184b..286de15cedc7 100644
--- a/drivers/hwmon/nzxt-smart2.c
+++ b/drivers/hwmon/nzxt-smart2.c
@@ -770,6 +770,7 @@ static int nzxt_smart2_hid_probe(struct hid_device *hdev,
 	hid_hw_close(hdev);
 
 out_hw_stop:
+	hid_device_io_stop(hdev);
 	hid_hw_stop(hdev);
 	return ret;
 }
-- 
2.45.2