linux-kernel - [PATCH 3.12 077/127] PM / sleep: fix device reference leak in test

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Message-Id: <270202d09fb6cdfbe89d19948c068b4487286693.1480062521.git.jslaby@suse.cz>
Date:   Fri, 25 Nov 2016 09:29:50 +0100
From:   Jiri Slaby <jslaby@...e.cz>
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Johan Hovold <johan@...nel.org>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 077/127] PM / sleep: fix device reference leak in test_suspend

From: Johan Hovold <johan@...nel.org>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit ceb75787bc75d0a7b88519ab8a68067ac690f55a upstream.

Make sure to drop the reference taken by class_find_device() after
opening the RTC device.

Fixes: 77437fd4e61f (pm: boot time suspend selftest)
Signed-off-by: Johan Hovold <johan@...nel.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 kernel/power/suspend_test.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/kernel/power/suspend_test.c b/kernel/power/suspend_test.c
index 269b097e78ea..743615bfdcec 100644
--- a/kernel/power/suspend_test.c
+++ b/kernel/power/suspend_test.c
@@ -169,8 +169,10 @@ static int __init test_suspend(void)
 
 	/* RTCs have initialized by now too ... can we use one? */
 	dev = class_find_device(rtc_class, NULL, NULL, has_wakealarm);
-	if (dev)
+	if (dev) {
 		rtc = rtc_class_open(dev_name(dev));
+		put_device(dev);
+	}
 	if (!rtc) {
 		printk(warn_no_rtc);
 		goto done;
-- 
2.10.2