From 51893f88dd916efead5e24a212c907b2cd35e160 Mon Sep 17 00:00:00 2001 From: Nathan Holstein Date: Wed, 9 Jun 2010 15:46:25 -0400 Subject: [PATCH] Bluetooth: Fix bug with ERTM minimum packet length ERTM and streaming mode L2CAP sockets have no minimum packet length. Only basic mode connections have minimum length. Instead, validate the packet containing all necessary control, FCS, and SAR fields. The patch fixes the drop of valid packets with length lower than 4. Signed-off-by: Nathan Holstein Signed-off-by: Gustavo F. Padovan Signed-off-by: Marcel Holtmann --- net/bluetooth/l2cap.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/net/bluetooth/l2cap.c b/net/bluetooth/l2cap.c index b89762134e4..4af8fc0d512 100644 --- a/net/bluetooth/l2cap.c +++ b/net/bluetooth/l2cap.c @@ -4092,9 +4092,9 @@ static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk { struct sock *sk; struct l2cap_pinfo *pi; - u16 control, len; + u16 control; u8 tx_seq, req_seq; - int next_tx_seq_offset, req_seq_offset; + int len, next_tx_seq_offset, req_seq_offset; sk = l2cap_get_chan_by_scid(&conn->chan_list, cid); if (!sk) { @@ -4164,7 +4164,7 @@ static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk } if (__is_iframe(control)) { - if (len < 4) { + if (len < 0) { l2cap_send_disconn_req(pi->conn, sk); goto drop; } @@ -4192,7 +4192,7 @@ static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk if (pi->fcs == L2CAP_FCS_CRC16) len -= 2; - if (len > pi->mps || len < 4 || __is_sframe(control)) + if (len > pi->mps || len < 0 || __is_sframe(control)) goto drop; if (l2cap_check_fcs(pi, skb)) -- 2.41.0