batman-adv: fix erroneous client entry duplicate detection

The translation table implementation, namely batadv_compare_tt(),
is used to compare two client entries and deciding if they are the
holding the same information. Each client entry is identified by
its mac address and its VLAN id (VID).
Consequently, batadv_compare_tt() has to not only compare the mac
addresses but also the VIDs.

Without this fix adding a new client entry that possesses the same
mac address as another client but operates on a different VID will
fail because both client entries will considered identical.

Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>

diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c
index a3fc90338f39c975e020b4ed0058c791715fd9bb..76f19ba62462bf03fadba72171d3ae01a565ba57 100644 (file)
--- a/net/batman-adv/translation-table.c
+++ b/net/batman-adv/translation-table.c
@@ -68,13 +68,15 @@ static void batadv_tt_global_del(struct batadv_priv *bat_priv,
                                 unsigned short vid, const char *message,
                                 bool roaming);
 
-/* returns 1 if they are the same mac addr */
+/* returns 1 if they are the same mac addr and vid */
 static int batadv_compare_tt(const struct hlist_node *node, const void *data2)
 {
        const void *data1 = container_of(node, struct batadv_tt_common_entry,
                                         hash_entry);
+       const struct batadv_tt_common_entry *tt1 = data1;
+       const struct batadv_tt_common_entry *tt2 = data2;
 
-       return batadv_compare_eth(data1, data2);
+       return (tt1->vid == tt2->vid) && batadv_compare_eth(data1, data2);
 }
 
 /**