batman-adv: skip the window protection test when the originator has no neighbours

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 <lindner_marek@yahoo.de>
Signed-off-by: Antonio Quartulli <ordex@autistici.org>

1 files changed, 2 insertions, 1 deletions

diff --git a/net/batman-adv/bat_iv_ogm.c b/net/batman-adv/bat_iv_ogm.c
index 1014210bb365..8b2db2e76c7e 100644
--- a/net/batman-adv/bat_iv_ogm.c
+++ b/net/batman-adv/bat_iv_ogm.c
@@ -861,7 +861,8 @@ 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;