[PATCH 5.14 662/849] power: supply: bq27xxx: Fix kernel crash on IRQ handler register error

From: Greg Kroah-Hartman
Date: Mon Nov 15 2021 - 18:14:57 EST


From: Hans de Goede <hdegoede@xxxxxxxxxx>

[ Upstream commit cdf10ffe8f626d8a2edc354abf063df0078b2d71 ]

When registering the IRQ handler fails, do not just return the error code,
this will free the devm_kzalloc()-ed data struct while leaving the queued
work queued and the registered power_supply registered with both of them
now pointing to free-ed memory, resulting in various kernel crashes
soon afterwards.

Instead properly tear-down things on IRQ handler register errors.

Fixes: 703df6c09795 ("power: bq27xxx_battery: Reorganize I2C into a module")
Cc: Andrew F. Davis <afd@xxxxxx>
Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
Reviewed-by: Andy Shevchenko <andy.shevchenko@xxxxxxxxx>
Signed-off-by: Sebastian Reichel <sebastian.reichel@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/power/supply/bq27xxx_battery_i2c.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/power/supply/bq27xxx_battery_i2c.c b/drivers/power/supply/bq27xxx_battery_i2c.c
index 46f078350fd3f..cf38cbfe13e9d 100644
--- a/drivers/power/supply/bq27xxx_battery_i2c.c
+++ b/drivers/power/supply/bq27xxx_battery_i2c.c
@@ -187,7 +187,8 @@ static int bq27xxx_battery_i2c_probe(struct i2c_client *client,
dev_err(&client->dev,
"Unable to register IRQ %d error %d\n",
client->irq, ret);
- return ret;
+ bq27xxx_battery_teardown(di);
+ goto err_failed;
}
}

--
2.33.0