linux-kernel - [PATCH] mcb: fix a double free bug in chameleon_parse

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Message-Id: <20250228032720.3745459-1-haoxiang_li2024@163.com>
Date: Fri, 28 Feb 2025 11:27:20 +0800
From: Haoxiang Li <haoxiang_li2024@....com>
To: morbidrsa@...il.com,
	gregkh@...uxfoundation.org
Cc: linux-kernel@...r.kernel.org,
	Haoxiang Li <haoxiang_li2024@....com>,
	stable@...r.kernel.org
Subject: [PATCH] mcb: fix a double free bug in chameleon_parse_gdd()

In chameleon_parse_gdd(), if mcb_device_register() fails, 'mdev'
would be released in mcb_device_register() via put_device().
Thus, goto 'err' label and free 'mdev' again causes a double free.
Just return if mcb_device_register() fails.

Fixes: 3764e82e5150 ("drivers: Introduce MEN Chameleon Bus")
Cc: stable@...r.kernel.org
Signed-off-by: Haoxiang Li <haoxiang_li2024@....com>
---
 drivers/mcb/mcb-parse.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mcb/mcb-parse.c b/drivers/mcb/mcb-parse.c
index 02a680c73979..bf0d7d58c8b0 100644
--- a/drivers/mcb/mcb-parse.c
+++ b/drivers/mcb/mcb-parse.c
@@ -96,7 +96,7 @@ static int chameleon_parse_gdd(struct mcb_bus *bus,
 
 	ret = mcb_device_register(bus, mdev);
 	if (ret < 0)
-		goto err;
+		return ret;
 
 	return 0;
 
-- 
2.25.1