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authorAntonio Quartulli <ordex@autistici.org>2011-10-16 20:32:03 +0200
committerSven Eckelmann <sven@narfation.org>2011-11-20 13:08:34 +0100
commit8b7342d673d31e7aa60baae35321c11532275cdb (patch)
tree5e6790ae621aad9fda859fcb39aa626dcfb8bb4d /net/batman-adv
parentdc58fe32e6a4fbd270e8f045225ce475073d0772 (diff)
batman-adv: check for tt_reponse packet real length
Before accessing the TT_RESPONSE packet payload, the node has to ensure that the packet is long enough as it would expect to be. Reported-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de> Signed-off-by: Antonio Quartulli <ordex@autistici.org> Signed-off-by: Sven Eckelmann <sven@narfation.org>
Diffstat (limited to 'net/batman-adv')
-rw-r--r--net/batman-adv/routing.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/net/batman-adv/routing.c b/net/batman-adv/routing.c
index e0e7b7b79ca..ef24a7205f6 100644
--- a/net/batman-adv/routing.c
+++ b/net/batman-adv/routing.c
@@ -578,6 +578,7 @@ int recv_tt_query(struct sk_buff *skb, struct hard_iface *recv_if)
{
struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
struct tt_query_packet *tt_query;
+ uint16_t tt_len;
struct ethhdr *ethhdr;
/* drop packet if it has not necessary minimum size */
@@ -622,6 +623,14 @@ int recv_tt_query(struct sk_buff *skb, struct hard_iface *recv_if)
if (skb_linearize(skb) < 0)
goto out;
+ tt_len = tt_query->tt_data * sizeof(struct tt_change);
+
+ /* Ensure we have all the claimed data */
+ if (unlikely(skb_headlen(skb) <
+ sizeof(struct tt_query_packet) +
+ tt_len))
+ goto out;
+
handle_tt_response(bat_priv, tt_query);
} else {
bat_dbg(DBG_TT, bat_priv,