L2CAP Enhanced Retransmission Mode shall ignore all I-frames with a
duplicated txSeq.
Signed-off-by: Gustavo F. Padovan <padovan@xxxxxxxxxxxxxx>
Reviewed-by: João Paulo Rechi Vita <jprvita@xxxxxxxxxxxxxx>
---
net/bluetooth/l2cap.c | 7 +++++++
1 files changed, 7 insertions(+), 0 deletions(-)
diff --git a/net/bluetooth/l2cap.c b/net/bluetooth/l2cap.c
index 85f97b9..b431dc5 100644
--- a/net/bluetooth/l2cap.c
+++ b/net/bluetooth/l2cap.c
@@ -3413,6 +3413,13 @@ static inline int l2cap_data_channel_iframe(struct sock *sk, u16 rx_control, str
if (tx_seq == pi->expected_tx_seq)
goto expected;
+ /* Check for duplicated tx_seq. This actually
+ * subtracts 1 from expected_tx_seq */
+ if (tx_seq == (pi->expected_tx_seq + 63) % 64) {
+ kfree_skb(skb);
+ return 0;
+ }
+
if (pi->conn_state & L2CAP_CONN_SREJ_SENT) {
struct srej_list *first;
--
1.6.4.4
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