linux-kernel - [PATCH] clockevents: decrement reference count when device

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Message-Id: <20190121153013.24681-1-tiny.windzz@gmail.com>
Date:   Mon, 21 Jan 2019 10:30:13 -0500
From:   Yangtao Li <tiny.windzz@...il.com>
To:     tglx@...utronix.de
Cc:     linux-kernel@...r.kernel.org, Yangtao Li <tiny.windzz@...il.com>
Subject: [PATCH] clockevents: decrement reference count when device_register() fail

device_register() may fail, use put_device() giving up the refconut
to avoid refcount leak.

Signed-off-by: Yangtao Li <tiny.windzz@...il.com>
---
 kernel/time/clockevents.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/kernel/time/clockevents.c b/kernel/time/clockevents.c
index 5e77662dd2d9..7b691dc97349 100644
--- a/kernel/time/clockevents.c
+++ b/kernel/time/clockevents.c
@@ -719,7 +719,9 @@ static __init int tick_broadcast_init_sysfs(void)
 {
 	int err = device_register(&tick_bc_dev);
 
-	if (!err)
+	if (err)
+		put_device(&tick_bc_dev);
+	else
 		err = device_create_file(&tick_bc_dev, &dev_attr_current_device);
 	return err;
 }
@@ -746,8 +748,10 @@ static int __init tick_init_sysfs(void)
 			err = device_create_file(dev, &dev_attr_current_device);
 		if (!err)
 			err = device_create_file(dev, &dev_attr_unbind_device);
-		if (err)
+		if (err) {
+			put_device(dev);
 			return err;
+		}
 	}
 	return tick_broadcast_init_sysfs();
 }
-- 
2.17.0