linux-kernel - [PATCH v2] coresight: syscfg: Fix memleak on registration failure in cscfg_create

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Date:   Mon, 24 Jan 2022 12:41:21 +0000
From:   Miaoqian Lin <linmq006@...il.com>
To:     mathieu.poirier@...aro.org
Cc:     alexander.shishkin@...ux.intel.com, coresight@...ts.linaro.org,
        leo.yan@...aro.org, linmq006@...il.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        mike.leach@...aro.org, suzuki.poulose@....com
Subject: [PATCH v2] coresight: syscfg: Fix memleak on registration failure in cscfg_create_device

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>
---
Changes in v2:
- simply call put_device() instead of cscfg_dev_release() in the error
path of cscfg_create_device.
---
 drivers/hwtracing/coresight/coresight-syscfg.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/hwtracing/coresight/coresight-syscfg.c b/drivers/hwtracing/coresight/coresight-syscfg.c
index 43054568430f..c30989e0675f 100644
--- 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);
-- 
2.17.1