[PATCH] iio: inv_mpu6050: Fix use-after-free in ACPI code

[Crestez Dan Leonard]

In some cases this can result in incorrectly returning a negative value
from asus_acpi_get_sensor_info and the AK8963 magnetometer failing to
show up.

Cc: Srinivas Pandruvada <srinivas.pandruv...@linux.intel.com>
Signed-off-by: Crestez Dan Leonard <leonard.cres...@intel.com>
---
 drivers/iio/imu/inv_mpu6050/inv_mpu_acpi.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_acpi.c 
b/drivers/iio/imu/inv_mpu6050/inv_mpu_acpi.c
index 2771106..f770472 100644
--- a/drivers/iio/imu/inv_mpu6050/inv_mpu_acpi.c
+++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_acpi.c
@@ -56,6 +56,7 @@ static int asus_acpi_get_sensor_info(struct acpi_device *adev,
        int i;
        acpi_status status;
        union acpi_object *cpm;
+       int ret;
 
        status = acpi_evaluate_object(adev->handle, "CNF0", NULL, &buffer);
        if (ACPI_FAILURE(status))
@@ -82,10 +83,10 @@ static int asus_acpi_get_sensor_info(struct acpi_device 
*adev,
                        }
                }
        }
-
+       ret = cpm->package.count;
        kfree(buffer.pointer);
 
-       return cpm->package.count;
+       return ret;
 }
 
 static int acpi_i2c_check_resource(struct acpi_resource *ares, void *data)
-- 
2.5.5