linux-kernel - [PATCH 4.14 286/496] macsec: missing dev_put() on error in macsec

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Date:   Mon, 28 May 2018 12:01:11 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dan Carpenter <dan.carpenter@...cle.com>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.14 286/496] macsec: missing dev_put() on error in macsec_newlink()

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Dan Carpenter <dan.carpenter@...cle.com>

[ Upstream commit 5dcd8400884cc4a043a6d4617e042489e5d566a9 ]

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>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/macsec.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/drivers/net/macsec.c
+++ b/drivers/net/macsec.c
@@ -3248,7 +3248,7 @@ static int macsec_newlink(struct net *ne
 
 	err = netdev_upper_dev_link(real_dev, dev);
 	if (err < 0)
-		goto unregister;
+		goto put_dev;
 
 	/* need to be already registered so that ->init has run and
 	 * the MAC addr is set
@@ -3284,7 +3284,8 @@ del_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;
 }