linux-kernel - [PATCH 4.19 125/338] power: supply: ab8500: Fix memory leak in ab8500_fg_sysfs

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Message-Id: <20220414110842.460545819@linuxfoundation.org>
Date:   Thu, 14 Apr 2022 15:10:28 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Miaoqian Lin <linmq006@...il.com>,
        Sebastian Reichel <sebastian.reichel@...labora.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 125/338] power: supply: ab8500: Fix memory leak in ab8500_fg_sysfs_init

From: Miaoqian Lin <linmq006@...il.com>

[ Upstream commit 6a4760463dbc6b603690938c468839985189ce0a ]

kobject_init_and_add() takes reference even when it fails.
According to the doc of kobject_init_and_add()：

   If this function returns an error, kobject_put() must be called to
   properly clean up the memory associated with the object.

Fix memory leak by calling kobject_put().

Fixes: 8c0984e5a753 ("power: move power supply drivers to power/supply")
Signed-off-by: Miaoqian Lin <linmq006@...il.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@...labora.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/power/supply/ab8500_fg.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/power/supply/ab8500_fg.c b/drivers/power/supply/ab8500_fg.c
index b0e77324b016..675f9d0e8471 100644
--- a/drivers/power/supply/ab8500_fg.c
+++ b/drivers/power/supply/ab8500_fg.c
@@ -2541,8 +2541,10 @@ static int ab8500_fg_sysfs_init(struct ab8500_fg *di)
 	ret = kobject_init_and_add(&di->fg_kobject,
 		&ab8500_fg_ktype,
 		NULL, "battery");
-	if (ret < 0)
+	if (ret < 0) {
+		kobject_put(&di->fg_kobject);
 		dev_err(di->dev, "failed to create sysfs entry\n");
+	}
 
 	return ret;
 }
-- 
2.34.1