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power: supply: da9150: Fix use after free bug in da9150_charger_remove due to race condition 

In da9150_charger_probe, &charger->otg_work is bound with
da9150_charger_otg_work. da9150_charger_otg_ncb may be
called to start the work.

If we remove the module which will call da9150_charger_remove
to make cleanup, there may be a unfinished work. The possible
sequence is as follows:

Fix it by canceling the work before cleanup in the da9150_charger_remove

CPU0                  CPUc1

                    |da9150_charger_otg_work
da9150_charger_remove      |
power_supply_unregister  |
device_unregister   |
power_supply_dev_release|
kfree(psy)          |
                    |
                    | 	power_supply_changed(charger->usb);
                    |   //use

Fixes: c1a281e34d ("power: Add support for DA9150 Charger")
Signed-off-by: Zheng Wang <zyytlz.wz@163.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
This commit is contained in:
Zheng Wang 2023-03-12 01:46:50 +08:00 committed by Sebastian Reichel
parent 47c29d6921
commit 06615d11cc
1 changed files with 1 additions and 0 deletions
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drivers/power/supply/da9150-charger.c
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@ -657,6 +657,7 @@ static int da9150_charger_remove(struct platform_device *pdev)
if (!IS_ERR_OR_NULL(charger->usb_phy))
usb_unregister_notifier(charger->usb_phy, &charger->otg_nb);
cancel_work_sync(&charger->otg_work);
power_supply_unregister(charger->battery);
power_supply_unregister(charger->usb);