linux-kernel - [PATCH v2] net: appletalk: Fix device refcount leak in atrtr

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Message-ID: <tencent_E1A26771CDAB389A0396D1681A90A49E5D09@qq.com>
Date: Wed,  9 Jul 2025 03:52:51 +0000
From: veritas501@...mail.com
To: davem@...emloft.net
Cc: Kito Xu <veritas501@...mail.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Simon Horman <horms@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...nel.org>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2] net: appletalk: Fix device refcount leak in atrtr_create()

From: Kito Xu <veritas501@...mail.com>

When updating an existing route entry in atrtr_create(), the old device
reference was not being released before assigning the new device,
leading to a device refcount leak. Fix this by calling dev_put() to
release the old device reference before holding the new one.

Fixes: c7f905f0f6d4 ("[ATALK]: Add missing dev_hold() to atrtr_create().")
Signed-off-by: Kito Xu <veritas501@...mail.com>
---
 net/appletalk/ddp.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/appletalk/ddp.c b/net/appletalk/ddp.c
index 73ea7e67f05a..30242fe10341 100644
--- a/net/appletalk/ddp.c
+++ b/net/appletalk/ddp.c
@@ -576,6 +576,7 @@ static int atrtr_create(struct rtentry *r, struct net_device *devhint)
 
 	/* Fill in the routing entry */
 	rt->target  = ta->sat_addr;
+	dev_put(rt->dev); /* Release old device */
 	dev_hold(devhint);
 	rt->dev     = devhint;
 	rt->flags   = r->rt_flags;
-- 
2.34.1