Bluetooth: Fix auto-creation of hci_conn at Conn Complete event

Currently the code auto-creates hci_conn only if the remote address has
been discovered before. This may not be the case. For example, the
remote device may trigger connection after reboot at already-paired
state so there is no inquiry result found, but it is still correct to
create the hci_conn when Connection Complete event is received.

A better guard is to check against bredr allowlist. Devices in the
allowlist have been given permission to auto-connect.

Fixes: 4f40afc6c764 ("Bluetooth: Handle BR/EDR devices during suspend")
Signed-off-by: Sonny Sasaka <sonnysasaka@chromium.org>
Reviewed-by: Abhishek Pandit-Subedi <abhishekpandit@chromium.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index bd306ba..1df9514 100644 (file)
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -2566,7 +2566,6 @@ static void hci_inquiry_result_evt(struct hci_dev *hdev, struct sk_buff *skb)
 static void hci_conn_complete_evt(struct hci_dev *hdev, struct sk_buff *skb)
 {
        struct hci_ev_conn_complete *ev = (void *) skb->data;
-       struct inquiry_entry *ie;
        struct hci_conn *conn;
 
        BT_DBG("%s", hdev->name);
@@ -2575,13 +2574,19 @@ static void hci_conn_complete_evt(struct hci_dev *hdev, struct sk_buff *skb)
 
        conn = hci_conn_hash_lookup_ba(hdev, ev->link_type, &ev->bdaddr);
        if (!conn) {
-               /* Connection may not exist if auto-connected. Check the inquiry
-                * cache to see if we've already discovered this bdaddr before.
-                * If found and link is an ACL type, create a connection class
+               /* Connection may not exist if auto-connected. Check the bredr
+                * allowlist to see if this device is allowed to auto connect.
+                * If link is an ACL type, create a connection class
                 * automatically.
+                *
+                * Auto-connect will only occur if the event filter is
+                * programmed with a given address. Right now, event filter is
+                * only used during suspend.
                 */
-               ie = hci_inquiry_cache_lookup(hdev, &ev->bdaddr);
-               if (ie && ev->link_type == ACL_LINK) {
+               if (ev->link_type == ACL_LINK &&
+                   hci_bdaddr_list_lookup_with_flags(&hdev->whitelist,
+                                                     &ev->bdaddr,
+                                                     BDADDR_BREDR)) {
                        conn = hci_conn_add(hdev, ev->link_type, &ev->bdaddr,
                                            HCI_ROLE_SLAVE);
                        if (!conn) {