power: supply: cw2015: Fix potential null-ptr-deref in cw_bat_probe()

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[ Upstream commit 97f2b4ddb0 ]

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: b4c7715c10 ("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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Shang XiaoJing 2022-11-17 10:45:58 +08:00 • committed by Greg Kroah-Hartman

parent be11e09513

commit 5150b76aa2

1 changed files with 3 additions and 0 deletions

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drivers/power/supply/cw2015_battery.c

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