Patch "PM / QoS: return -EINVAL for bogus strings" has been added to the 4.9-stable tree

Patch "PM / QoS: return -EINVAL for bogus strings" has been added to the 4.9-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    PM / QoS: return -EINVAL for bogus strings

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     pm-qos-return-einval-for-bogus-strings.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 2ca30331c156ca9e97643ad05dd8930b8fe78b01 Mon Sep 17 00:00:00 2001
From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Mon, 10 Jul 2017 10:21:40 +0300
Subject: PM / QoS: return -EINVAL for bogus strings

From: Dan Carpenter <dan.carpenter@oracle.com>

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>

---
 drivers/base/power/sysfs.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/base/power/sysfs.c
+++ b/drivers/base/power/sysfs.c
@@ -268,6 +268,8 @@ static ssize_t pm_qos_latency_tolerance_
 			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;


Patches currently in stable-queue which might be from dan.carpenter@oracle.com are

queue-4.9/rocker-move-dereference-before-free.patch
queue-4.9/pm-qos-return-einval-for-bogus-strings.patch