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authorSven Van Asbroeck <thesven73@gmail.com>2019-02-16 00:43:02 +0300
committerSebastian Reichel <sebastian.reichel@collabora.com>2019-04-05 19:01:38 +0300
commit0cd0e49711556d2331a06b1117b68dd786cb54d2 (patch)
tree96039b9bd4b451eb2e13739b8fa6321d2242e7f9 /drivers/power
parentec4628effbb7cf1f5241b41936540d986715f3bb (diff)
downloadlinux-0cd0e49711556d2331a06b1117b68dd786cb54d2.tar.xz
power: supply: max14656: fix potential use-before-alloc
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 <akurz@blala.de> Signed-off-by: Sven Van Asbroeck <TheSven73@gmail.com> Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Diffstat (limited to 'drivers/power')
-rw-r--r--drivers/power/supply/max14656_charger_detector.c14
1 files changed, 7 insertions, 7 deletions
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;