linux-kernel - [19/84] ifb: fix oops when loading the ifb failed

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Date:	Wed, 31 Jul 2013 15:23:09 +0200
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org,
	"dingtianhong" <dingtianhong@...wei.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [19/84] ifb: fix oops when loading the ifb failed

3.2.50-rc1 review patch.  If anyone has any objections, please let me know.

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

From: dingtianhong <dingtianhong@...wei.com>

[ Upstream commit f2966cd5691058b8674a20766525bedeaea9cbcf ]

If __rtnl_link_register() return faild when loading the ifb, it will
take the wrong path and get oops, so fix it just like dummy.

Signed-off-by: Ding Tianhong <dingtianhong@...wei.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/net/ifb.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/ifb.c b/drivers/net/ifb.c
index 4924a1e..b19841a 100644
--- a/drivers/net/ifb.c
+++ b/drivers/net/ifb.c
@@ -290,6 +290,8 @@ static int __init ifb_init_module(void)
 
 	rtnl_lock();
 	err = __rtnl_link_register(&ifb_link_ops);
+	if (err < 0)
+		goto out;
 
 	for (i = 0; i < numifbs && !err; i++) {
 		err = ifb_init_one(i);
@@ -297,6 +299,8 @@ static int __init ifb_init_module(void)
 	}
 	if (err)
 		__rtnl_link_unregister(&ifb_link_ops);
+
+out:
 	rtnl_unlock();
 
 	return err;

--
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