linux-kernel - [PATCH] siox: fix possible memory leak in siox_device

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Message-ID: <20221104021334.618189-1-yangyingliang@huawei.com>
Date:   Fri, 4 Nov 2022 10:13:34 +0800
From:   Yang Yingliang <yangyingliang@...wei.com>
To:     <linux-kernel@...r.kernel.org>
CC:     <t.scherer@...elmann.de>, <u.kleine-koenig@...gutronix.de>,
        <kernel@...gutronix.de>
Subject: [PATCH] siox: fix possible memory leak in siox_device_add()

If device_register() returns error in siox_device_add(),
the name allocated by dev_set_name() need be freed. As
comment of device_register() says, it should use put_device()
to give up the reference in the error path. So fix this
by calling put_device(), then the name can be freed in
kobject_cleanup(), and sdevice is freed in siox_device_release(),
set it to null in error path.

Fixes: bbecb07fa0af ("siox: new driver framework for eckelmann SIOX")
Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
---
 drivers/siox/siox-core.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/siox/siox-core.c b/drivers/siox/siox-core.c
index 7c4f32d76966..561408583b2b 100644
--- a/drivers/siox/siox-core.c
+++ b/drivers/siox/siox-core.c
@@ -839,6 +839,8 @@ static struct siox_device *siox_device_add(struct siox_master *smaster,
 
 err_device_register:
 	/* don't care to make the buffer smaller again */
+	put_device(&sdevice->dev);
+	sdevice = NULL;
 
 err_buf_alloc:
 	siox_master_unlock(smaster);
-- 
2.25.1