linux-kernel - [PATCH net v5 4/4] ax25: Change kfree() in ax25_dev_free() to ax25_dev

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Date: Tue,  7 May 2024 15:03:42 +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,
	jreuter@...na.de,
	dan.carpenter@...aro.org,
	Duoming Zhou <duoming@....edu.cn>
Subject: [PATCH net v5 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 c6ab9b0f0be..2a40c78f6a0 100644
--- a/net/ax25/ax25_dev.c
+++ b/net/ax25/ax25_dev.c
@@ -195,7 +195,7 @@ 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