When we receive an OGM from from a node for the first time, the last_real_seqno
field of the orig_node structure has not been initialised yet. The value of this
field is used to compute the current ogm-seqno window and therefore the
protection mechanism will probably drop the packet due to an out-of-window error.
To avoid this situation this patch adds a check to skip the window protection
mechanism if no neighbour nodes have already been added. When the first
neighbour node is added, the last_real_seqno field is initialised too.

Reported-by: Marek Lindner<redacted>
Signed-off-by: Antonio Quartulli<redacted>
---
  bat_iv_ogm.c |    3 ++-
  1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/bat_iv_ogm.c b/bat_iv_ogm.c
index c42e030..d9195b3 100644
--- a/bat_iv_ogm.c
+++ b/bat_iv_ogm.c

@@ -869,7 +869,8 @@ static int bat_iv_ogm_update_seqnos(const struct ethhdr *ethhdr,
  	seq_diff = batman_ogm_packet->seqno - orig_node->last_real_seqno;

  	/* signalize caller that the packet is to be dropped. */
-	if (window_protected(bat_priv, seq_diff,
+	if (!hlist_empty(&orig_node->neigh_list)&&
+	    window_protected(bat_priv, seq_diff,
  			&orig_node->batman_seqno_reset))
  		goto out;