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authorMarek Lindner <lindner_marek@yahoo.de>2013-03-04 06:39:49 +0400
committerAntonio Quartulli <ordex@autistici.org>2013-03-12 01:59:47 +0400
commitb47506d91259c29b9c75c404737eb6525556f9b4 (patch)
treec23e5fb025c23fc7a19a0c5fdf4fdcd411596a9f
parent7c6baa304b841673d3a55ea4fcf9a5cbf7a1674b (diff)
downloadlinux-b47506d91259c29b9c75c404737eb6525556f9b4.tar.xz
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>
-rw-r--r--net/batman-adv/bat_iv_ogm.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/net/batman-adv/bat_iv_ogm.c b/net/batman-adv/bat_iv_ogm.c
index a0b253ecadaf..a5bb0a769eb9 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;