power: supply: cw2015: Fix potential null-ptr-deref in cw_bat_probe()
[ Upstream commit
97f2b4ddb0aa700d673691a7d5e44d226d22bab7 ]
cw_bat_probe() calls create_singlethread_workqueue() and not checked the
ret value, which may return NULL. And a null-ptr-deref may happen:
cw_bat_probe()
create_singlethread_workqueue() # failed, cw_bat->wq is NULL
queue_delayed_work()
queue_delayed_work_on()
__queue_delayed_work() # warning here, but continue
__queue_work() # access wq->flags, null-ptr-deref
Check the ret value and return -ENOMEM if it is NULL.
Fixes:
b4c7715c10c1 ("power: supply: add CellWise cw2015 fuel gauge driver")
Signed-off-by: Shang XiaoJing <shangxiaojing@huawei.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>