linux-kernel - [PATCH 4.9 112/120] bus: vexpress-config: fix device reference leak

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Message-Id: <20170118104652.703304370@linuxfoundation.org>
Date:   Wed, 18 Jan 2017 11:47:10 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Sudeep Holla <sudeep.holla@....com>,
        Johan Hovold <johan@...nel.org>, Arnd Bergmann <arnd@...db.de>
Subject: [PATCH 4.9 112/120] bus: vexpress-config: fix device reference leak

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

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

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

commit c090959b9dd8c87703e275079aa4b4a824ba3f8e upstream.

Make sure to drop the reference to the parent device taken by
class_find_device() after populating the bus.

Fixes: 3b9334ac835b ("mfd: vexpress: Convert custom func API to regmap")
Acked-by: Sudeep Holla <sudeep.holla@....com>
Signed-off-by: Johan Hovold <johan@...nel.org>
Signed-off-by: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/bus/vexpress-config.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

--- a/drivers/bus/vexpress-config.c
+++ b/drivers/bus/vexpress-config.c
@@ -171,6 +171,7 @@ static int vexpress_config_populate(stru
 {
 	struct device_node *bridge;
 	struct device *parent;
+	int ret;
 
 	bridge = of_parse_phandle(node, "arm,vexpress,config-bridge", 0);
 	if (!bridge)
@@ -182,7 +183,11 @@ static int vexpress_config_populate(stru
 	if (WARN_ON(!parent))
 		return -ENODEV;
 
-	return of_platform_populate(node, NULL, NULL, parent);
+	ret = of_platform_populate(node, NULL, NULL, parent);
+
+	put_device(parent);
+
+	return ret;
 }
 
 static int __init vexpress_config_init(void)