From 78b99eb1faa7371bf9c534690f26a71b6996622d Mon Sep 17 00:00:00 2001 From: Frédéric Danis Date: Fri, 8 Dec 2023 18:41:50 +0100 Subject: Bluetooth: L2CAP: Send reject on command corrupted request MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit L2CAP/COS/CED/BI-02-C PTS test send a malformed L2CAP signaling packet with 2 commands in it (a connection request and an unknown command) and expect to get a connection response packet and a command reject packet. The second is currently not sent. Cc: stable@vger.kernel.org Signed-off-by: Frédéric Danis Signed-off-by: Luiz Augusto von Dentz --- net/bluetooth/l2cap_core.c | 21 +++++++++++++++------ 1 file changed, 15 insertions(+), 6 deletions(-) (limited to 'net/bluetooth') diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c index 17ca13e8c044..baeebee41cd9 100644 --- a/net/bluetooth/l2cap_core.c +++ b/net/bluetooth/l2cap_core.c @@ -6492,6 +6492,14 @@ drop: kfree_skb(skb); } +static inline void l2cap_sig_send_rej(struct l2cap_conn *conn, u16 ident) +{ + struct l2cap_cmd_rej_unk rej; + + rej.reason = cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD); + l2cap_send_cmd(conn, ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej); +} + static inline void l2cap_sig_channel(struct l2cap_conn *conn, struct sk_buff *skb) { @@ -6517,23 +6525,24 @@ static inline void l2cap_sig_channel(struct l2cap_conn *conn, if (len > skb->len || !cmd->ident) { BT_DBG("corrupted command"); + l2cap_sig_send_rej(conn, cmd->ident); break; } err = l2cap_bredr_sig_cmd(conn, cmd, len, skb->data); if (err) { - struct l2cap_cmd_rej_unk rej; - BT_ERR("Wrong link type (%d)", err); - - rej.reason = cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD); - l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ, - sizeof(rej), &rej); + l2cap_sig_send_rej(conn, cmd->ident); } skb_pull(skb, len); } + if (skb->len > 0) { + BT_DBG("corrupted command"); + l2cap_sig_send_rej(conn, 0); + } + drop: kfree_skb(skb); } -- cgit