hwmon: Fix potential UAF in pec_store

Sashiko reports:

In pec_store(), a guard(mutex)(&hwdev->lock) is taken. If the chip write
operation returns an error other than -EOPNOTSUPP, the code jumps to the
put label, which calls put_device(hdev). If this drops the final reference,
the device is freed. When the function then returns, the guard cleanup
function runs and attempts to unlock the freed mutex.

Use scoped_guard() instead of guard() to avoid the problem.

Fixes: 3ad2a7b9b15d5 ("hwmon: Serialize accesses in hwmon core")
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

0 files changed, 0 insertions, 0 deletions