From: Zheng Wang <zyytlz.wz@163.com>
Date: Fri, 10 Mar 2023 01:47:28 +0800
Subject: [PATCH] power: supply: bq24190: Fix use after free bug in
 bq24190_remove due to race condition
References: bsc#1012628
Patch-mainline: 6.2.9
Git-commit: 47c29d69212911f50bdcdd0564b5999a559010d4

[ Upstream commit 47c29d69212911f50bdcdd0564b5999a559010d4 ]

In bq24190_probe, &bdi->input_current_limit_work is bound
with bq24190_input_current_limit_work. When external power
changed, it will call bq24190_charger_external_power_changed
 to start the work.

If we remove the module which will call bq24190_remove to make
cleanup, there may be a unfinished work. The possible
sequence is as follows:

CPU0                  CPUc1

                    |bq24190_input_current_limit_work
bq24190_remove      |
power_supply_unregister  |
device_unregister   |
power_supply_dev_release|
kfree(psy)          |
                    |
                    | power_supply_get_property_from_supplier
                    |   //use

Fix it by finishing the work before cleanup in the bq24190_remove

Fixes: 97774672573a ("power_supply: Initialize changed_work before calling device_add")
Signed-off-by: Zheng Wang <zyytlz.wz@163.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
 drivers/power/supply/bq24190_charger.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/power/supply/bq24190_charger.c b/drivers/power/supply/bq24190_charger.c
index 2b2c3a43..6bd71193 100644
--- a/drivers/power/supply/bq24190_charger.c
+++ b/drivers/power/supply/bq24190_charger.c
@@ -1906,6 +1906,7 @@ static void bq24190_remove(struct i2c_client *client)
 	struct bq24190_dev_info *bdi = i2c_get_clientdata(client);
 	int error;
 
+	cancel_delayed_work_sync(&bdi->input_current_limit_work);
 	error = pm_runtime_resume_and_get(bdi->dev);
 	if (error < 0)
 		dev_warn(bdi->dev, "pm_runtime_get failed: %i\n", error);
-- 
2.35.3