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Bluetooth: Completes the I-frame tx_seq check logic on RECV
Add checks for invalid tx_seq and fixes the duplicated tx_seq check. 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>
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@ -3302,7 +3302,7 @@ static inline void l2cap_send_i_or_rr_or_rnr(struct sock *sk)
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}
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}
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static void l2cap_add_to_srej_queue(struct sock *sk, struct sk_buff *skb, u8 tx_seq, u8 sar)
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static int l2cap_add_to_srej_queue(struct sock *sk, struct sk_buff *skb, u8 tx_seq, u8 sar)
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{
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struct sk_buff *next_skb;
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@ -3312,13 +3312,16 @@ static void l2cap_add_to_srej_queue(struct sock *sk, struct sk_buff *skb, u8 tx_
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next_skb = skb_peek(SREJ_QUEUE(sk));
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if (!next_skb) {
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__skb_queue_tail(SREJ_QUEUE(sk), skb);
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return;
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return 0;
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}
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do {
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if (bt_cb(next_skb)->tx_seq == tx_seq)
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return -EINVAL;
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if (bt_cb(next_skb)->tx_seq > tx_seq) {
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__skb_queue_before(SREJ_QUEUE(sk), next_skb, skb);
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return;
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return 0;
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}
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if (skb_queue_is_last(SREJ_QUEUE(sk), next_skb))
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@ -3327,6 +3330,8 @@ static void l2cap_add_to_srej_queue(struct sock *sk, struct sk_buff *skb, u8 tx_
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} while ((next_skb = skb_queue_next(SREJ_QUEUE(sk), next_skb)));
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__skb_queue_tail(SREJ_QUEUE(sk), skb);
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return 0;
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}
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static int l2cap_ertm_reassembly_sdu(struct sock *sk, struct sk_buff *skb, u16 control)
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@ -3579,6 +3584,7 @@ static inline int l2cap_data_channel_iframe(struct sock *sk, u16 rx_control, str
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u8 tx_seq = __get_txseq(rx_control);
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u8 req_seq = __get_reqseq(rx_control);
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u8 sar = rx_control >> L2CAP_CTRL_SAR_SHIFT;
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u8 tx_seq_offset, expected_tx_seq_offset;
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int num_to_ack = (pi->tx_win/6) + 1;
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int err = 0;
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@ -3598,6 +3604,16 @@ static inline int l2cap_data_channel_iframe(struct sock *sk, u16 rx_control, str
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if (tx_seq == pi->expected_tx_seq)
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goto expected;
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tx_seq_offset = (tx_seq - pi->buffer_seq) % 64;
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if (tx_seq_offset < 0)
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tx_seq_offset += 64;
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/* invalid tx_seq */
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if (tx_seq_offset >= pi->tx_win) {
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l2cap_send_disconn_req(pi->conn, sk);
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goto drop;
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}
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if (pi->conn_state & L2CAP_CONN_SREJ_SENT) {
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struct srej_list *first;
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@ -3617,7 +3633,10 @@ static inline int l2cap_data_channel_iframe(struct sock *sk, u16 rx_control, str
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}
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} else {
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struct srej_list *l;
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l2cap_add_to_srej_queue(sk, skb, tx_seq, sar);
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/* duplicated tx_seq */
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if (l2cap_add_to_srej_queue(sk, skb, tx_seq, sar) < 0)
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goto drop;
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list_for_each_entry(l, SREJ_LIST(sk), list) {
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if (l->tx_seq == tx_seq) {
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@ -3628,6 +3647,15 @@ static inline int l2cap_data_channel_iframe(struct sock *sk, u16 rx_control, str
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l2cap_send_srejframe(sk, tx_seq);
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}
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} else {
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expected_tx_seq_offset =
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(pi->expected_tx_seq - pi->buffer_seq) % 64;
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if (expected_tx_seq_offset < 0)
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expected_tx_seq_offset += 64;
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/* duplicated tx_seq */
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if (tx_seq_offset < expected_tx_seq_offset)
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goto drop;
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pi->conn_state |= L2CAP_CONN_SREJ_SENT;
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INIT_LIST_HEAD(SREJ_LIST(sk));
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@ -3676,6 +3704,10 @@ expected:
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l2cap_send_ack(pi);
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return 0;
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drop:
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kfree_skb(skb);
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return 0;
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}
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static inline void l2cap_data_channel_rrframe(struct sock *sk, u16 rx_control)
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