Bluetooth: Fix not removing hci_conn for failed LE connection

This patch changes way LE Connection Complete event with error status are
handled. BDADDR returned in such event packet do not need to be valid and
should not be used to search for existing hci_conn. Instead, any hci_conn
with BT_CONNECT state should be matched since there can be only one
pending LE outgoing connection at any time.

If not handled properly, appriopriate hci_conn will not be removed and
subsequent connection to given peer will try to reuse it without making
actual connection attempt.

2012-05-07 11:21:39.133378 < HCI Command: LE Create Connection (0x08|0x000d) plen 25
    bdaddr 00:22:D0:10:13:EE type 1
2012-05-07 11:21:39.138774 > HCI Event: Command Status (0x0f) plen 4
    LE Create Connection (0x08|0x000d) status 0x00 ncmd 1
2012-05-07 11:21:44.752854 < HCI Command: LE Create Connection Cancel (0x08|0x000e) plen 0
2012-05-07 11:21:44.759475 > HCI Event: Command Complete (0x0e) plen 4
    LE Create Connection Cancel (0x08|0x000e) ncmd 1
2012-05-07 11:21:44.764479 > HCI Event: LE Meta Event (0x3e) plen 19
    LE Connection Complete
      status 0x02 handle 0, role master
      bdaddr 00:00:00:00:00:00 (Public)

[14898.739425] [6603] hci_connect: hci0 dst 00:22:D0:10:13:EE
[14898.739429] [6603] hci_conn_add: hci0 dst 00:22:D0:10:13:EE
[14898.739434] [6603] hci_conn_init_sysfs: conn ffff880079f03000
[14898.739440] [6603] hci_send_cmd: hci0 opcode 0x200d plen 25
[14898.739443] [6603] hci_send_cmd: skb len 28
[14898.739487] [6603] hci_chan_create: hci0 conn ffff880079f03000
...
[14938.860231] [55] hci_send_cmd: hci0 opcode 0x200e plen 0
...
[14938.876427] [55] hci_le_conn_complete_evt: hci0 status 2
[14938.876433] [55] hci_conn_add: hci0 dst 00:00:00:00:00:00
[14938.876439] [55] hci_conn_init_sysfs: conn ffff88007aeff800
[14938.876454] [55] hci_send_to_control: len 14
[14938.876470] [55] l2cap_connect_cfm: hcon ffff88007aeff800 bdaddr 00:00:00:00:00:00 status 2
[14938.876474] [55] hci_conn_del: hci0 conn ffff88007aeff800 handle 0
Signed-off-by: Andrzej Kaczmarek <andrzej.kaczmarek@tieto.com>
Acked-by: Andre Guedes <andre.guedes@openbossa.org>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>

net/bluetooth/hci_event.c

@@ -3306,6 +3306,19 @@ static void hci_le_conn_complete_evt(struct hci_dev *hdev, struct sk_buff *skb)
 
 	hci_dev_lock(hdev);
 
+	if (ev->status) {
+		conn = hci_conn_hash_lookup_state(hdev, LE_LINK, BT_CONNECT);
+		if (!conn)
+			goto unlock;
+
+		mgmt_connect_failed(hdev, &conn->dst, conn->type,
+				    conn->dst_type, ev->status);
+		hci_proto_connect_cfm(conn, ev->status);
+		conn->state = BT_CLOSED;
+		hci_conn_del(conn);
+		goto unlock;
+	}
+
 	conn = hci_conn_hash_lookup_ba(hdev, LE_LINK, &ev->bdaddr);
 	if (!conn) {
 		conn = hci_conn_add(hdev, LE_LINK, &ev->bdaddr);
@@ -3318,15 +3331,6 @@ static void hci_le_conn_complete_evt(struct hci_dev *hdev, struct sk_buff *skb)
 		conn->dst_type = ev->bdaddr_type;
 	}
 
-	if (ev->status) {
-		mgmt_connect_failed(hdev, &ev->bdaddr, conn->type,
-				    conn->dst_type, ev->status);
-		hci_proto_connect_cfm(conn, ev->status);
-		conn->state = BT_CLOSED;
-		hci_conn_del(conn);
-		goto unlock;
-	}
-
 	if (!test_and_set_bit(HCI_CONN_MGMT_CONNECTED, &conn->flags))
 		mgmt_device_connected(hdev, &ev->bdaddr, conn->type,
 				      conn->dst_type, 0, NULL, 0, NULL);