linux-kernel - [PATCH v2] power: supply: da9150: Fix use after free bug in da9150_charger

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Message-Id: <20230311174650.3979517-1-zyytlz.wz@163.com>
Date:   Sun, 12 Mar 2023 01:46:50 +0800
From:   Zheng Wang <zyytlz.wz@....com>
To:     njavali@...vell.com
Cc:     sebastian.reichel@...labora.com, mrangankar@...vell.com,
        GR-QLogic-Storage-Upstream@...vell.com, jejb@...ux.ibm.com,
        martin.petersen@...cle.com, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org, hackerzheng666@...il.com,
        1395428693sheep@...il.com, alex000young@...il.com,
        Zheng Wang <zyytlz.wz@....com>
Subject: [PATCH v2] 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: c1a281e34dae ("power: Add support for DA9150 Charger")
Signed-off-by: Zheng Wang <zyytlz.wz@....com>
---
v2:
- fix wrong description in commit message and mov cancel_work_sync
after usb_unregister_notifier suggested by Sebastian Reichel
---
 drivers/power/supply/da9150-charger.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/power/supply/da9150-charger.c b/drivers/power/supply/da9150-charger.c
index 14da5c595dd9..a87aeaea38e1 100644
--- a/drivers/power/supply/da9150-charger.c
+++ b/drivers/power/supply/da9150-charger.c
@@ -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);
-- 
2.25.1