ifb: fix oops when loading the ifb failed

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@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/net/ifb.c b/drivers/net/ifb.c
index a11f7a45cb5f..a3bed28197d2 100644
--- a/drivers/net/ifb.c
+++ b/drivers/net/ifb.c
@@ -291,6 +291,8 @@ 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);
@@ -298,6 +300,8 @@ static int __init ifb_init_module(void)
         }
         if (err)
                 __rtnl_link_unregister(&ifb_link_ops);
+
+out:
         rtnl_unlock();
 
         return err;