batman-adv: Don't leak information through uninitialized packet fields

The reserved fields in batman-adv packets are not set to a constant value. The
content of these memory regions is leaked unintentionally to the network.

This regression was introduced in 3b27ffb00fbe9d9189715ea13ce8712e2f0cb0c5

Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Antonio Quartulli <ordex@autistici.org>

3 files changed, 4 insertions, 0 deletions

diff --git a/net/batman-adv/soft-interface.c b/net/batman-adv/soft-interface.c
index b7c655cf626a..9e4bb61301ec 100644
--- a/net/batman-adv/soft-interface.c
+++ b/net/batman-adv/soft-interface.c
@@ -214,6 +214,7 @@ static int batadv_interface_tx(struct sk_buff *skb,
 
                 /* batman packet type: broadcast */
                 bcast_packet->header.packet_type = BATADV_BCAST;
+                bcast_packet->reserved = 0;
 
                 /* hw address of first interface is the orig mac because only
                  * this mac is known throughout the mesh
diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c
index 245cc9a068d8..a438f4b582fc 100644
--- a/net/batman-adv/translation-table.c
+++ b/net/batman-adv/translation-table.c
@@ -2052,6 +2052,7 @@ static void batadv_send_roam_adv(struct batadv_priv *bat_priv, uint8_t *client,
         roam_adv_packet->header.packet_type = BATADV_ROAM_ADV;
         roam_adv_packet->header.version = BATADV_COMPAT_VERSION;
         roam_adv_packet->header.ttl = BATADV_TTL;
+        roam_adv_packet->reserved = 0;
         primary_if = batadv_primary_if_get_selected(bat_priv);
         if (!primary_if)
                 goto out;
diff --git a/net/batman-adv/vis.c b/net/batman-adv/vis.c
index f09cc9ad6ad8..2a2ea0681469 100644
--- a/net/batman-adv/vis.c
+++ b/net/batman-adv/vis.c
@@ -589,6 +589,7 @@ static int batadv_generate_vis_packet(struct batadv_priv *bat_priv)
         packet->header.ttl = BATADV_TTL;
         packet->seqno = htonl(ntohl(packet->seqno) + 1);
         packet->entries = 0;
+        packet->reserved = 0;
         skb_trim(info->skb_packet, sizeof(*packet));
 
         if (packet->vis_type == BATADV_VIS_TYPE_CLIENT_UPDATE) {
@@ -890,6 +891,7 @@ int batadv_vis_init(struct batadv_priv *bat_priv)
         packet->header.packet_type = BATADV_VIS;
         packet->header.ttl = BATADV_TTL;
         packet->seqno = 0;
+        packet->reserved = 0;
         packet->entries = 0;
 
         INIT_LIST_HEAD(&bat_priv->vis_send_list);