batman-adv: correctly set the data field in the TT_REPONSE packet

In the TT_RESPONSE packet, the number of carried entries is not correctly set.
This leads to a wrong interpretation of the packet payload on the receiver side
causing random entries to be added to the global translation table. Therefore
the latter gets always corrupted, triggering a table recovery all the time.

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

1 files changed, 4 insertions, 1 deletions

diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c
index f599db9dbec..ef1acfd7653 100644
--- a/net/batman-adv/translation-table.c
+++ b/net/batman-adv/translation-table.c
@@ -999,7 +999,6 @@ static struct sk_buff *tt_response_fill_table(uint16_t tt_len, uint8_t ttvn,
         tt_response = (struct tt_query_packet *)skb_put(skb,
                                                      tt_query_size + tt_len);
         tt_response->ttvn = ttvn;
-        tt_response->tt_data = htons(tt_tot);
 
         tt_change = (struct tt_change *)(skb->data + tt_query_size);
         tt_count = 0;
@@ -1025,6 +1024,10 @@ static struct sk_buff *tt_response_fill_table(uint16_t tt_len, uint8_t ttvn,
         }
         rcu_read_unlock();
 
+        /* store in the message the number of entries we have successfully
+         * copied */
+        tt_response->tt_data = htons(tt_count);
+
 out:
         return skb;
 }