Bluetooth: Fix drop of packets with invalid req_seq/tx_seq

We shall not use an unsigned var since we are expecting negatives value
there. Using unsigned causes ERTM connection to close due to invalid
ReqSeq numbers.

Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

1 files changed, 3 insertions, 2 deletions

diff --git a/net/bluetooth/l2cap.c b/net/bluetooth/l2cap.c
index 6c5462b2a244..7e39d9ee0b9c 100644
--- a/net/bluetooth/l2cap.c
+++ b/net/bluetooth/l2cap.c
@@ -3796,7 +3796,7 @@ static inline int l2cap_data_channel_iframe(struct sock *sk, u16 rx_control, str
         u8 tx_seq = __get_txseq(rx_control);
         u8 req_seq = __get_reqseq(rx_control);
         u8 sar = rx_control >> L2CAP_CTRL_SAR_SHIFT;
-        u8 tx_seq_offset, expected_tx_seq_offset;
+        int tx_seq_offset, expected_tx_seq_offset;
         int num_to_ack = (pi->tx_win/6) + 1;
         int err = 0;
 
@@ -4081,7 +4081,8 @@ 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, req_seq, next_tx_seq_offset, req_seq_offset;
+        u8 tx_seq, req_seq;
+        int next_tx_seq_offset, req_seq_offset;
 
         sk = l2cap_get_chan_by_scid(&conn->chan_list, cid);
         if (!sk) {