linux-kernel - [PATCH 4.1 049/202] leds/led-class: Add missing put

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Message-Id: <20151018014904.202842320@linuxfoundation.org>
Date:	Sat, 17 Oct 2015 18:57:12 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Alan Tull <delicious.quinoa@...il.com>,
	Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>,
	Jacek Anaszewski <j.anaszewski@...sung.com>
Subject: [PATCH 4.1 049/202] leds/led-class: Add missing put_device()

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

------------------

From: Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>

commit e5b5a61fcb3743f1dacf9e20d28f48423cecf0c1 upstream.

Devices found by class_find_device must be freed with put_device().
Otherwise the reference count will not work properly.

Fixes: a96aa64cb572 ("leds/led-class: Handle LEDs with the same name")
Reported-by: Alan Tull <delicious.quinoa@...il.com>
Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
Signed-off-by: Jacek Anaszewski <j.anaszewski@...sung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/leds/led-class.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

--- a/drivers/leds/led-class.c
+++ b/drivers/leds/led-class.c
@@ -223,12 +223,15 @@ static int led_classdev_next_name(const
 {
 	unsigned int i = 0;
 	int ret = 0;
+	struct device *dev;
 
 	strlcpy(name, init_name, len);
 
-	while (class_find_device(leds_class, NULL, name, match_name) &&
-	       (ret < len))
+	while ((ret < len) &&
+	       (dev = class_find_device(leds_class, NULL, name, match_name))) {
+		put_device(dev);
 		ret = snprintf(name, len, "%s_%u", init_name, ++i);
+	}
 
 	if (ret >= len)
 		return -ENOMEM;


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