From: Antonio Quartulli ordex@autistici.org
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 --- net/batman-adv/routing.c | 9 +++++++++ 1 files changed, 9 insertions(+), 0 deletions(-)
diff --git a/net/batman-adv/routing.c b/net/batman-adv/routing.c index e0e7b7b..ef24a72 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,