netdev - [PATCH] macsec: missing dev_put() on error in macsec

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Date:   Wed, 21 Mar 2018 11:09:01 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     "David S. Miller" <davem@...emloft.net>,
        Sabrina Dubroca <sd@...asysnail.net>
Cc:     David Ahern <dsahern@...il.com>,
        David Windsor <dwindsor@...il.com>,
        Elena Reshetova <elena.reshetova@...el.com>,
        "Jason A. Donenfeld" <Jason@...c4.com>,
        Matthias Schiffer <mschiffer@...verse-factory.net>,
        Johannes Berg <johannes.berg@...el.com>,
        Felix Walter <felix.walter@...udandheat.com>,
        Girish Moodalbail <girish.moodalbail@...cle.com>,
        netdev@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH] macsec: missing dev_put() on error in macsec_newlink()

We moved the dev_hold(real_dev); call earlier in the function but forgot
to update the error paths.

Fixes: 0759e552bce7 ("macsec: fix negative refcnt on parent link")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

diff --git a/drivers/net/macsec.c b/drivers/net/macsec.c
index 7de88b33d5b9..9cbb0c8a896a 100644
--- a/drivers/net/macsec.c
+++ b/drivers/net/macsec.c
@@ -3277,7 +3277,7 @@ static int macsec_newlink(struct net *net, struct net_device *dev,
 
 	err = netdev_upper_dev_link(real_dev, dev, extack);
 	if (err < 0)
-		goto unregister;
+		goto put_dev;
 
 	/* need to be already registered so that ->init has run and
 	 * the MAC addr is set
@@ -3316,7 +3316,8 @@ static int macsec_newlink(struct net *net, struct net_device *dev,
 	macsec_del_dev(macsec);
 unlink:
 	netdev_upper_dev_unlink(real_dev, dev);
-unregister:
+put_dev:
+	dev_put(real_dev);
 	unregister_netdevice(dev);
 	return err;
 }