hwmon: (acpi_power_meter) Fix potential memory leak in acpi_power_meter_add()

Although it rarely happens, we should call free_capabilities()
if error happens after read_capabilities() to free allocated strings.

Fixes: de584afa5e188 ("hwmon driver for ACPI 4.0 power meters")
Signed-off-by: Misono Tomohiro <misono.tomohiro@jp.fujitsu.com>
Link: https://lore.kernel.org/r/20200625043242.31175-1-misono.tomohiro@jp.fujitsu.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

diff --git a/drivers/hwmon/acpi_power_meter.c b/drivers/hwmon/acpi_power_meter.c
index 0db8ef4..a270b97 100644 (file)
--- a/drivers/hwmon/acpi_power_meter.c
+++ b/drivers/hwmon/acpi_power_meter.c
@@ -883,7 +883,7 @@ static int acpi_power_meter_add(struct acpi_device *device)
 
        res = setup_attrs(resource);
        if (res)
-               goto exit_free;
+               goto exit_free_capability;
 
        resource->hwmon_dev = hwmon_device_register(&device->dev);
        if (IS_ERR(resource->hwmon_dev)) {
@@ -896,6 +896,8 @@ static int acpi_power_meter_add(struct acpi_device *device)
 
 exit_remove:
        remove_attrs(resource);
+exit_free_capability:
+       free_capabilities(resource);
 exit_free:
        kfree(resource);
 exit: