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Bluetooth: Close L2CAP channel on invalid ReqSeq

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Signed-off-by: João Paulo Rechi Vita <jprvita@profusion.mobi>
Acked-by: Gustavo F. Padovan <padovan@profusion.mobi>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
João Paulo Rechi Vita 2010-05-01 16:15:43 -03:00 committed by Marcel Holtmann
parent afefdbc4cf
commit 01760bdde9
1 changed files with 17 additions and 1 deletions
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18
net/bluetooth/l2cap.c
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@ -3772,7 +3772,7 @@ static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk
struct sock *sk;
struct l2cap_pinfo *pi;
u16 control, len;
u8 tx_seq;
u8 tx_seq, req_seq, next_tx_seq_offset, req_seq_offset;
sk = l2cap_get_chan_by_scid(&conn->chan_list, cid);
if (!sk) {
@ -3823,6 +3823,22 @@ static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk
if (l2cap_check_fcs(pi, skb))
goto drop;
req_seq = __get_reqseq(control);
req_seq_offset = (req_seq - pi->expected_ack_seq) % 64;
if (req_seq_offset < 0)
req_seq_offset += 64;
next_tx_seq_offset =
(pi->next_tx_seq - pi->expected_ack_seq) % 64;
if (next_tx_seq_offset < 0)
next_tx_seq_offset += 64;
/* check for invalid req-seq */
if (req_seq_offset > next_tx_seq_offset) {
l2cap_send_disconn_req(pi->conn, sk);
goto drop;
}
if (__is_iframe(control)) {
if (len < 4)
goto drop;