batman: fix a bogus warning from batadv_is_on_batman_iface()

batman tries to search dev->iflink to check if it's a batman interface,
but ->iflink could be 0, which is not a valid ifindex. It should just
avoid iflink == 0 case.

Reported-by: Jet Chen <jet.chen@intel.com>
Tested-by: Jet Chen <jet.chen@intel.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Steffen Klassert <steffen.klassert@secunet.com>
Cc: Antonio Quartulli <antonio@open-mesh.com>
Cc: Marek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: Cong Wang <cwang@twopensource.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 1 deletions

diff --git a/net/batman-adv/hard-interface.c b/net/batman-adv/hard-interface.c
index b851cc580853..fbda6b54baff 100644
--- a/net/batman-adv/hard-interface.c
+++ b/net/batman-adv/hard-interface.c
@@ -83,7 +83,7 @@ static bool batadv_is_on_batman_iface(const struct net_device *net_dev)
                 return true;
 
         /* no more parents..stop recursion */
-        if (net_dev->iflink == net_dev->ifindex)
+        if (net_dev->iflink == 0 || net_dev->iflink == net_dev->ifindex)
                 return false;
 
         /* recurse over the parent device */