linux-kernel - [PATCH 4.19 48/58] Drivers: hv: vmbus: Fix memory leak in vmbus_add_channel

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Message-Id: <20220221084913.425983021@linuxfoundation.org>
Date:   Mon, 21 Feb 2022 09:49:41 +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, Miaoqian Lin <linmq006@...il.com>,
        Juan Vazquez <juvazq@...ux.microsoft.com>,
        Wei Liu <wei.liu@...nel.org>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 48/58] Drivers: hv: vmbus: Fix memory leak in vmbus_add_channel_kobj

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

[ Upstream commit 8bc69f86328e87a0ffa79438430cc82f3aa6a194 ]

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: c2e5df616e1a ("vmbus: add per-channel sysfs info")
Signed-off-by: Miaoqian Lin <linmq006@...il.com>
Reviewed-by: Juan Vazquez <juvazq@...ux.microsoft.com>
Link: https://lore.kernel.org/r/20220203173008.43480-1-linmq006@gmail.com
Signed-off-by: Wei Liu <wei.liu@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/hv/vmbus_drv.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index aab21c1534a10..51fe219c91fc3 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -1556,8 +1556,10 @@ int vmbus_add_channel_kobj(struct hv_device *dev, struct vmbus_channel *channel)
 	kobj->kset = dev->channels_kset;
 	ret = kobject_init_and_add(kobj, &vmbus_chan_ktype, NULL,
 				   "%u", relid);
-	if (ret)
+	if (ret) {
+		kobject_put(kobj);
 		return ret;
+	}
 
 	ret = sysfs_create_group(kobj, &vmbus_chan_group);
 
@@ -1566,6 +1568,7 @@ int vmbus_add_channel_kobj(struct hv_device *dev, struct vmbus_channel *channel)
 		 * The calling functions' error handling paths will cleanup the
 		 * empty channel directory.
 		 */
+		kobject_put(kobj);
 		dev_err(device, "Unable to set up channel sysfs files\n");
 		return ret;
 	}
-- 
2.34.1