linux-kernel - [PATCH] net: wan: sbni: fix device usage count

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Date:	Thu,  3 Sep 2015 11:30:30 +0530
From:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
To:	"David S. Miller" <davem@...emloft.net>
Cc:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	Sudip Mukherjee <sudipm.mukherjee@...il.com>
Subject: [PATCH] net: wan: sbni: fix device usage count

dev_get_by_name() will increment the usage count if the matching device
is found. But we were not decrementing the count if we have got the
device and the device is non-active.

Signed-off-by: Sudip Mukherjee <sudip@...torindia.org>
---
 drivers/net/wan/sbni.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/wan/sbni.c b/drivers/net/wan/sbni.c
index 758c4ba..8fef8d8 100644
--- a/drivers/net/wan/sbni.c
+++ b/drivers/net/wan/sbni.c
@@ -1358,6 +1358,8 @@ sbni_ioctl( struct net_device  *dev,  struct ifreq  *ifr,  int  cmd )
 		if( !slave_dev  ||  !(slave_dev->flags & IFF_UP) ) {
 			netdev_err(dev, "trying to enslave non-active device %s\n",
 				   slave_name);
+			if (slave_dev)
+				dev_put(slave_dev);
 			return  -EPERM;
 		}
 
-- 
1.9.1

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