From 5a286ced49117a29e65e47cb43fa878ade7a2a70 Mon Sep 17 00:00:00 2001 From: Sven Van Asbroeck Date: Fri, 15 Feb 2019 16:43:02 -0500 Subject: power: supply: max14656: fix potential use-before-alloc [ Upstream commit 0cd0e49711556d2331a06b1117b68dd786cb54d2 ] Call order on probe(): - max14656_hw_init() enables interrupts on the chip - devm_request_irq() starts processing interrupts, isr could be called immediately - isr: schedules delayed work (irq_work) - irq_work: calls power_supply_changed() - devm_power_supply_register() registers the power supply Depending on timing, it's possible that power_supply_changed() is called on an unregistered power supply structure. Fix by registering the power supply before requesting the irq. Cc: Alexander Kurz Signed-off-by: Sven Van Asbroeck Signed-off-by: Sebastian Reichel Signed-off-by: Sasha Levin --- drivers/power/supply/max14656_charger_detector.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) (limited to 'drivers/power') diff --git a/drivers/power/supply/max14656_charger_detector.c b/drivers/power/supply/max14656_charger_detector.c index b91b1d2999dc..d19307f791c6 100644 --- a/drivers/power/supply/max14656_charger_detector.c +++ b/drivers/power/supply/max14656_charger_detector.c @@ -280,6 +280,13 @@ static int max14656_probe(struct i2c_client *client, INIT_DELAYED_WORK(&chip->irq_work, max14656_irq_worker); + chip->detect_psy = devm_power_supply_register(dev, + &chip->psy_desc, &psy_cfg); + if (IS_ERR(chip->detect_psy)) { + dev_err(dev, "power_supply_register failed\n"); + return -EINVAL; + } + ret = devm_request_irq(dev, chip->irq, max14656_irq, IRQF_TRIGGER_FALLING, MAX14656_NAME, chip); @@ -289,13 +296,6 @@ static int max14656_probe(struct i2c_client *client, } enable_irq_wake(chip->irq); - chip->detect_psy = devm_power_supply_register(dev, - &chip->psy_desc, &psy_cfg); - if (IS_ERR(chip->detect_psy)) { - dev_err(dev, "power_supply_register failed\n"); - return -EINVAL; - } - schedule_delayed_work(&chip->irq_work, msecs_to_jiffies(2000)); return 0; -- cgit v1.2.3