[SRU][J][PATCH 1/1] Bluetooth: L2CAP: Send reject on command corrupted request

[Hui Wang]

From: Frédéric Danis <frederic.danis at collabora.com>

BugLink: https://bugs.launchpad.net/bugs/2047634

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 at vger.kernel.org
Signed-off-by: Frédéric Danis <frederic.danis at collabora.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz at intel.com>
(cherry picked from commit 78b99eb1faa7371bf9c534690f26a71b6996622d)
Signed-off-by: Hui Wang <hui.wang at canonical.com>
---
 net/bluetooth/l2cap_core.c | 21 +++++++++++++++------
 1 file changed, 15 insertions(+), 6 deletions(-)

diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c
index 0770286ecf0b..9f3596de90a7 100644
--- a/net/bluetooth/l2cap_core.c
+++ b/net/bluetooth/l2cap_core.c
@@ -6493,6 +6493,14 @@ static inline void l2cap_le_sig_channel(struct l2cap_conn *conn,
 	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)
 {
@@ -6518,23 +6526,24 @@ 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);
 }
-- 
2.34.1