netdev - [PATCH] appletalk: Fix potential refcount leak

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Date:   Mon, 24 Oct 2022 22:47:53 +0800
From:   Liang He <windhl@....com>
To:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, netdev@...r.kernel.org, windhl@....com
Subject: [PATCH] appletalk: Fix potential refcount leak

In atrtr_create(), we have added a dev_hold for the new reference.
However, based on the code, if the 'rt' is not NULL and its 'dev'
is not NULL, we should use dev_put() for the replaced reference.

Signed-off-by: Liang He <windhl@....com>
---
 net/appletalk/ddp.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/appletalk/ddp.c b/net/appletalk/ddp.c
index a06f4d4a6f47..7e317d6448d1 100644
--- a/net/appletalk/ddp.c
+++ b/net/appletalk/ddp.c
@@ -564,6 +564,7 @@ static int atrtr_create(struct rtentry *r, struct net_device *devhint)
 	/* Fill in the routing entry */
 	rt->target  = ta->sat_addr;
 	dev_hold(devhint);
+	dev_put(rt->dev);
 	rt->dev     = devhint;
 	rt->flags   = r->rt_flags;
 	rt->gateway = ga->sat_addr;
-- 
2.25.1