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power: supply: cw2015: Fix potential null-ptr-deref in cw_bat_probe()
[ Upstream commit 97f2b4d ] 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: b4c7715 ("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>
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