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authorDarrick J. Wong <djwong@us.ibm.com>2009-10-22 05:01:37 +0400
committerLen Brown <len.brown@intel.com>2009-11-05 20:25:39 +0300
commit22aecebfd9498c4779e5c5bed1d2d054bd99f7a4 (patch)
tree8fbb3ee3c1e49fd8736acd391aaaca350cb27c54 /drivers/acpi/power_meter.c
parent52a2b11cafb1b14bacfc65a20966da5ba3a863e1 (diff)
downloadlinux-22aecebfd9498c4779e5c5bed1d2d054bd99f7a4.tar.xz
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@us.ibm.com> Acked-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/acpi/power_meter.c')
-rw-r--r--drivers/acpi/power_meter.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/acpi/power_meter.c b/drivers/acpi/power_meter.c
index e6bfd77986b8..2ef7030a0c28 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,