rtnetlink: potential ERR_PTR dereference

In the original code, if rtnl_create_link() returned an ERR_PTR then that
would get passed to rtnl_configure_link() which dereferences it.

Signed-off-by: Dan Carpenter <error27@gmail.com>
Acked-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 2 deletions

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 4568120d853..fe776c9ddec 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -1270,10 +1270,11 @@ replay:
                         err = ops->newlink(net, dev, tb, data);
                 else
                         err = register_netdevice(dev);
-                if (err < 0 && !IS_ERR(dev)) {
+
+                if (err < 0 && !IS_ERR(dev))
                         free_netdev(dev);
+                if (err < 0)
                         goto out;
-                }
 
                 err = rtnl_configure_link(dev, ifm);
                 if (err < 0)