linux-kernel - [PATCH] misc: tifm: fix possible memory leak in tifm_7xx1_switch

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Message-ID: <20221117064725.3478402-1-ruanjinjie@huawei.com>
Date:   Thu, 17 Nov 2022 14:47:25 +0800
From:   ruanjinjie <ruanjinjie@...wei.com>
To:     <oakad@...oo.com>, <arnd@...db.de>, <gregkh@...uxfoundation.org>,
        <drzeus@...eus.cx>, <linux-kernel@...r.kernel.org>
CC:     <ruanjinjie@...wei.com>
Subject: [PATCH] misc: tifm: fix possible memory leak in tifm_7xx1_switch_media()

If device_register() returns error in tifm_7xx1_switch_media(),
name of kobject which is allocated in dev_set_name() called in device_add()
is leaked.

Never directly free @dev after calling device_register(), even
if it returned an error! Always use put_device() to give up the
reference initialized.

Fixes: 2428a8fe2261 ("tifm: move common device management tasks from tifm_7xx1 to tifm_core")
Signed-off-by: ruanjinjie <ruanjinjie@...wei.com>
---
 drivers/misc/tifm_7xx1.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/misc/tifm_7xx1.c b/drivers/misc/tifm_7xx1.c
index 017c2f7d6287..7dd86a9858ab 100644
--- a/drivers/misc/tifm_7xx1.c
+++ b/drivers/misc/tifm_7xx1.c
@@ -190,7 +190,7 @@ static void tifm_7xx1_switch_media(struct work_struct *work)
 				spin_unlock_irqrestore(&fm->lock, flags);
 			}
 			if (sock)
-				tifm_free_device(&sock->dev);
+				put_device(&sock->dev);
 		}
 		spin_lock_irqsave(&fm->lock, flags);
 	}
-- 
2.25.1