linux-kernel - [PATCH] acpi_power_meter: Don't leak ACPI error codes to userspace

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Date:	Wed, 21 Oct 2009 18:01:37 -0700
From:	"Darrick J. Wong" <djwong@...ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-acpi@...r.kernel.org, lm-sensors@...sensors.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] acpi_power_meter: Don't leak ACPI error codes to userspace

acpi-power-meter: Don't leak ACPI error codes to userspace

If the ACPI methods return an error code, we must return -EINVAL to userspace
to flag the error.  Right now we pass the (positive) number right through,
which causes echo to keep writing bogus values.

Signed-off-by: Darrick J. Wong <djwong@...ibm.com>
---

 drivers/acpi/power_meter.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)


diff --git a/drivers/acpi/power_meter.c b/drivers/acpi/power_meter.c
index e6bfd77..2ef7030 100644
--- a/drivers/acpi/power_meter.c
+++ b/drivers/acpi/power_meter.c
@@ -294,7 +294,11 @@ static int set_acpi_trip(struct acpi_power_meter_resource *resource)
 		return -EINVAL;
 	}
 
-	return data;
+	/* _PTP returns 0 on success, nonzero otherwise */
+	if (data)
+		return -EINVAL;
+
+	return 0;
 }
 
 static ssize_t set_trip(struct device *dev, struct device_attribute *devattr,
--
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