linux-kernel - [RFC v1 2/3] max17042_battery: fix potential user-after-free on module unload

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Date:   Mon,  4 Feb 2019 17:09:51 -0500
From:   Sven Van Asbroeck <thesven73@...il.com>
To:     Tejun Heo <tj@...nel.org>
Cc:     Lai Jiangshan <jiangshanlai@...il.com>,
        linux-kernel@...r.kernel.org, Sebastian Reichel <sre@...nel.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Kees Cook <keescook@...omium.org>
Subject: [RFC v1 2/3] max17042_battery: fix potential user-after-free on module unload

The work which is scheduled on a POR boot is potentially left
pending or running until after the driver module is unloaded.

Fix by using resource-controlled version of INIT_WORK().

Signed-off-by: Sven Van Asbroeck <TheSven73@...glemail.com>
---
 drivers/power/supply/max17042_battery.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/power/supply/max17042_battery.c b/drivers/power/supply/max17042_battery.c
index 2a8d75e5e930..a61e2b81f68a 100644
--- a/drivers/power/supply/max17042_battery.c
+++ b/drivers/power/supply/max17042_battery.c
@@ -1100,7 +1100,10 @@ static int max17042_probe(struct i2c_client *client,
 
 	regmap_read(chip->regmap, MAX17042_STATUS, &val);
 	if (val & STATUS_POR_BIT) {
-		INIT_WORK(&chip->work, max17042_init_worker);
+		ret = devm_init_work(&client->dev, &chip->work,
+				max17042_init_worker);
+		if (ret)
+			return ret;
 		schedule_work(&chip->work);
 	} else {
 		chip->init_complete = 1;
-- 
2.17.1