linux-kernel - [ 12/26] dlci: acquire rtnl_lock before calling __dev_get_by

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Message-Id: <20130701200731.280665414@linuxfoundation.org>
Date:	Mon,  1 Jul 2013 13:10:07 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Li Zefan <lizefan@...wei.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [ 12/26] dlci: acquire rtnl_lock before calling __dev_get_by_name()

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

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

From: Zefan Li <lizefan@...wei.com>

commit 11eb2645cbf38a08ae491bf6c602eea900ec0bb5 upstream.

Otherwise the net device returned can be freed at anytime.

Signed-off-by: Li Zefan <lizefan@...wei.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/net/wan/dlci.c |   14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

--- a/drivers/net/wan/dlci.c
+++ b/drivers/net/wan/dlci.c
@@ -385,20 +385,24 @@ static int dlci_del(struct dlci_add *dlc
 	struct net_device	*master, *slave;
 	int			err;
 
+	rtnl_lock();
+
 	/* validate slave device */
 	master = __dev_get_by_name(&init_net, dlci->devname);
-	if (!master)
-		return -ENODEV;
+	if (!master) {
+		err = -ENODEV;
+		goto out;
+	}
 
 	if (netif_running(master)) {
-		return -EBUSY;
+		err = -EBUSY;
+		goto out;
 	}
 
 	dlp = netdev_priv(master);
 	slave = dlp->slave;
 	flp = netdev_priv(slave);
 
-	rtnl_lock();
 	err = (*flp->deassoc)(slave, master);
 	if (!err) {
 		list_del(&dlp->list);
@@ -407,8 +411,8 @@ static int dlci_del(struct dlci_add *dlc
 
 		dev_put(slave);
 	}
+out:
 	rtnl_unlock();
-
 	return err;
 }
 


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