From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Mon, 10 Jul 2017 10:21:40 +0300
Subject: [PATCH] PM / QoS: return -EINVAL for bogus strings
References: bnc#1060662
Patch-mainline: v4.12.3
Git-commit: 2ca30331c156ca9e97643ad05dd8930b8fe78b01
 
commit 2ca30331c156ca9e97643ad05dd8930b8fe78b01 upstream.
 
In the current code, if the user accidentally writes a bogus command to
this sysfs file, then we set the latency tolerance to an uninitialized
variable.
 
Fixes: 2d984ad132a8 (PM / QoS: Introcuce latency tolerance device PM QoS type)
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
 drivers/base/power/sysfs.c | 2 ++
 1 file changed, 2 insertions(+)
 
diff --git a/drivers/base/power/sysfs.c b/drivers/base/power/sysfs.c
index 33b4b902741a..2df45ec8d935 100644
--- a/drivers/base/power/sysfs.c
+++ b/drivers/base/power/sysfs.c
@@ -272,6 +272,8 @@ static ssize_t pm_qos_latency_tolerance_store(struct device *dev,
 			value = PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT;
 		else if (!strcmp(buf, "any") || !strcmp(buf, "any\n"))
 			value = PM_QOS_LATENCY_ANY;
+		else
+			return -EINVAL;
 	}
 	ret = dev_pm_qos_update_user_latency_tolerance(dev, value);
 	return ret < 0 ? ret : n;
-- 
2.14.2