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iio: inv_mpu6050: Fix use-after-free in ACPI code 

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.

Note cpm is an alias for buffer.pointer which isn't apparent in this
patch on it's own.

Cc: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Crestez Dan Leonard <leonard.crestez@intel.com>
Acked-by: Daniel Baluta <daniel.baluta@intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Crestez Dan Leonard 2016-06-03 21:30:24 +03:00 committed by Jonathan Cameron
parent a9cc400615
commit 6e85dbe4b4
1 changed files with 3 additions and 2 deletions
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5
drivers/iio/imu/inv_mpu6050/inv_mpu_acpi.c
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@ -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)