linux-kernel - [PATCH net v2 1/2] ax25: change kfree in ax25_dev_free to ax25_dev

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Message-Id: <81bc171fb2246201236c341e9b7d799f509d7dd4.1714690906.git.duoming@zju.edu.cn>
Date: Fri,  3 May 2024 07:36:15 +0800
From: Duoming Zhou <duoming@....edu.cn>
To: netdev@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
	linux-hams@...r.kernel.org,
	pabeni@...hat.com,
	kuba@...nel.org,
	edumazet@...gle.com,
	davem@...emloft.net,
	jreuter@...na.de,
	horms@...nel.org,
	Markus.Elfring@....de,
	dan.carpenter@...aro.org,
	lars@...bit.com,
	Duoming Zhou <duoming@....edu.cn>
Subject: [PATCH net v2 1/2] ax25: change kfree in ax25_dev_free to ax25_dev_free

The ax25_dev is managed by reference counting, so it should not be
deallocated directly by kfree() in ax25_dev_free(), replace it with
ax25_dev_put() instead.

Fixes: d01ffb9eee4a ("ax25: add refcount in ax25_dev to avoid UAF bugs")
Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
Signed-off-by: Duoming Zhou <duoming@....edu.cn>
---
 net/ax25/ax25_dev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ax25/ax25_dev.c b/net/ax25/ax25_dev.c
index 282ec581c07..07723095c60 100644
--- a/net/ax25/ax25_dev.c
+++ b/net/ax25/ax25_dev.c
@@ -208,7 +208,7 @@ void __exit ax25_dev_free(void)
 		s        = ax25_dev;
 		netdev_put(ax25_dev->dev, &ax25_dev->dev_tracker);
 		ax25_dev = ax25_dev->next;
-		kfree(s);
+		ax25_dev_put(s);
 	}
 	ax25_dev_list = NULL;
 	spin_unlock_bh(&ax25_dev_lock);
-- 
2.17.1