linux-kernel - [PATCH 5.16 0045/1017] coresight: syscfg: Fix memleak on registration failure in cscfg_create

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Message-Id: <20220405070355.520237785@linuxfoundation.org>
Date:   Tue,  5 Apr 2022 09:15:58 +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>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Suzuki K Poulose <suzuki.poulose@....com>
Subject: [PATCH 5.16 0045/1017] coresight: syscfg: Fix memleak on registration failure in cscfg_create_device

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

commit cfa5dbcdd7aece76f3415284569f2f384aff0253 upstream.

device_register() calls device_initialize(),
according to doc of device_initialize:

    Use put_device() to give up your reference instead of freeing
    * @dev directly once you have called this function.

To prevent potential memleak, use put_device() for error handling.

Signed-off-by: Miaoqian Lin <linmq006@...il.com>
Fixes: 85e2414c518a ("coresight: syscfg: Initial coresight system configuration")
Cc: stable@...r.kernel.org
Link: https://lore.kernel.org/r/20220124124121.8888-1-linmq006@gmail.com
Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/hwtracing/coresight/coresight-syscfg.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/hwtracing/coresight/coresight-syscfg.c
+++ b/drivers/hwtracing/coresight/coresight-syscfg.c
@@ -791,7 +791,7 @@ static int cscfg_create_device(void)
 
 	err = device_register(dev);
 	if (err)
-		cscfg_dev_release(dev);
+		put_device(dev);
 
 create_dev_exit_unlock:
 	mutex_unlock(&cscfg_mutex);