diff options
Diffstat (limited to 'net/bluetooth/l2cap.c')
| -rw-r--r-- | net/bluetooth/l2cap.c | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/net/bluetooth/l2cap.c b/net/bluetooth/l2cap.c index 478def700c7c..31514d8faa66 100644 --- a/net/bluetooth/l2cap.c +++ b/net/bluetooth/l2cap.c @@ -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; |