linux-kernel - [PATCH net v4 4/4] ax25: Change kfree() in ax25_dev_free() to ax25_dev

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Message-Id: <7fdad05adf75ab7e2f6aad4d4c596e0361ce55dd.1715059894.git.duoming@zju.edu.cn>
Date: Tue,  7 May 2024 13:52:55 +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 v4 4/4] ax25: Change kfree() in ax25_dev_free() to ax25_dev_put()

The object "ax25_dev" is managed by reference counting. Thus it should
not be directly released by a kfree() call in ax25_dev_free(). Replace
it with a ax25_dev_put() call instead.

Fixes: d01ffb9eee4a ("ax25: add refcount in ax25_dev to avoid UAF bugs")
Suggested-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 05e556cdc2b..d4d29879df2 100644
--- a/net/ax25/ax25_dev.c
+++ b/net/ax25/ax25_dev.c
@@ -194,7 +194,7 @@ void __exit ax25_dev_free(void)
 	list_for_each_entry_safe(s, n, &ax25_dev_list, list) {
 		netdev_put(s->dev, &s->dev_tracker);
 		list_del(&s->list);
-		kfree(s);
+		ax25_dev_put(s)
 	}
 	spin_unlock_bh(&ax25_dev_lock);
 }
-- 
2.17.1