The following commit has been merged in the master branch: commit b47506d91259c29b9c75c404737eb6525556f9b4 Author: Marek Lindner lindner_marek@yahoo.de Date: Mon Mar 4 10:39:49 2013 +0800

batman-adv: verify tt len does not exceed packet len

batadv_iv_ogm_process() accesses the packet using the tt_num_changes attribute regardless of the real packet len (assuming the length check was done before). Therefore a length check is needed to avoid reading random memory.

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

diff --git a/net/batman-adv/bat_iv_ogm.c b/net/batman-adv/bat_iv_ogm.c index a0b253e..a5bb0a7 100644 --- a/net/batman-adv/bat_iv_ogm.c +++ b/net/batman-adv/bat_iv_ogm.c @@ -1288,7 +1288,8 @@ static int batadv_iv_ogm_receive(struct sk_buff *skb, batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff;

/* unpack the aggregated packets and process them one by one */ - do { + while (batadv_iv_ogm_aggr_packet(buff_pos, packet_len, + batadv_ogm_packet->tt_num_changes)) { tt_buff = packet_buff + buff_pos + BATADV_OGM_HLEN;

batadv_iv_ogm_process(ethhdr, batadv_ogm_packet, tt_buff, @@ -1299,8 +1300,7 @@ static int batadv_iv_ogm_receive(struct sk_buff *skb,

packet_pos = packet_buff + buff_pos; batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos; - } while (batadv_iv_ogm_aggr_packet(buff_pos, packet_len, - batadv_ogm_packet->tt_num_changes)); + }

kfree_skb(skb); return NET_RX_SUCCESS;