netdev - [PATCH 07/13] Bluetooth: Fix SREJ

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Date:	Thu,  8 Jul 2010 16:59:56 -0300
From:	Marcel Holtmann <marcel@...tmann.org>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org
Subject: [PATCH 07/13] Bluetooth: Fix SREJ_QUEUE corruption in L2CAP

From: João Paulo Rechi Vita <jprvita@...fusion.mobi>

Since all TxSeq values are modulo, we shall not compare them directly. We
have to compare their offset inside the TxWindow instead.

Signed-off-by: João Paulo Rechi Vita <jprvita@...fusion.mobi>
Acked-by: Gustavo F. Padovan <padovan@...fusion.mobi>
Signed-off-by: Marcel Holtmann <marcel@...tmann.org>
---
 net/bluetooth/l2cap.c |   13 ++++++++++++-
 1 files changed, 12 insertions(+), 1 deletions(-)

diff --git a/net/bluetooth/l2cap.c b/net/bluetooth/l2cap.c
index 4df5473..df21cdc 100644
--- a/net/bluetooth/l2cap.c
+++ b/net/bluetooth/l2cap.c
@@ -3387,6 +3387,8 @@ static inline void l2cap_send_i_or_rr_or_rnr(struct sock *sk)
 static int l2cap_add_to_srej_queue(struct sock *sk, struct sk_buff *skb, u8 tx_seq, u8 sar)
 {
 	struct sk_buff *next_skb;
+	struct l2cap_pinfo *pi = l2cap_pi(sk);
+	int tx_seq_offset, next_tx_seq_offset;
 
 	bt_cb(skb)->tx_seq = tx_seq;
 	bt_cb(skb)->sar = sar;
@@ -3397,11 +3399,20 @@ static int l2cap_add_to_srej_queue(struct sock *sk, struct sk_buff *skb, u8 tx_s
 		return 0;
 	}
 
+	tx_seq_offset = (tx_seq - pi->buffer_seq) % 64;
+	if (tx_seq_offset < 0)
+		tx_seq_offset += 64;
+
 	do {
 		if (bt_cb(next_skb)->tx_seq == tx_seq)
 			return -EINVAL;
 
-		if (bt_cb(next_skb)->tx_seq > tx_seq) {
+		next_tx_seq_offset = (bt_cb(next_skb)->tx_seq -
+						pi->buffer_seq) % 64;
+		if (next_tx_seq_offset < 0)
+			next_tx_seq_offset += 64;
+
+		if (next_tx_seq_offset > tx_seq_offset) {
 			__skb_queue_before(SREJ_QUEUE(sk), next_skb, skb);
 			return 0;
 		}
-- 
1.7.1.1

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