Staging: batman-adv: Don't dereference unchecked incoming soft_iface

send_packet derefenced forw_packet->if_incoming and checked if
forw_packet->if_incoming is NULL.

This cannot happen, but still makes irritates when reading through the
functions.

Reported-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Sven Eckelmann <sven.eckelmann@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 5 insertions, 2 deletions

diff --git a/drivers/staging/batman-adv/send.c b/drivers/staging/batman-adv/send.c
index 5d57ef5120b0..903286159b6e 100644
--- a/drivers/staging/batman-adv/send.c
+++ b/drivers/staging/batman-adv/send.c
@@ -160,8 +160,8 @@ static void send_packet_to_if(struct forw_packet *forw_packet,
 static void send_packet(struct forw_packet *forw_packet)
 {
         struct batman_if *batman_if;
-        struct net_device *soft_iface = forw_packet->if_incoming->soft_iface;
-        struct bat_priv *bat_priv = netdev_priv(soft_iface);
+        struct net_device *soft_iface;
+        struct bat_priv *bat_priv;
         struct batman_packet *batman_packet =
                 (struct batman_packet *)(forw_packet->skb->data);
         unsigned char directlink = (batman_packet->flags & DIRECTLINK ? 1 : 0);
@@ -172,6 +172,9 @@ static void send_packet(struct forw_packet *forw_packet)
                 return;
         }
 
+        soft_iface = forw_packet->if_incoming->soft_iface;
+        bat_priv = netdev_priv(soft_iface);
+
         if (forw_packet->if_incoming->if_status != IF_ACTIVE)
                 return;