Bluetooth: Fix removing Long Term Key

[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / bluetooth / hci_event.c

diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index dcaa6dbbab2cfc505d069f1dc416cac94ff89117..cfca44f8d048929c1667b7ea421441fc5a8e630e 100644 (file)
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -3619,7 +3619,13 @@ static void hci_le_ltk_request_evt(struct hci_dev *hdev, struct sk_buff *skb)
 
        hci_send_cmd(hdev, HCI_OP_LE_LTK_REPLY, sizeof(cp), &cp);
 
-       if (ltk->type & HCI_SMP_STK) {
+       /* Ref. Bluetooth Core SPEC pages 1975 and 2004. STK is a
+        * temporary key used to encrypt a connection following
+        * pairing. It is used during the Encrypted Session Setup to
+        * distribute the keys. Later, security can be re-established
+        * using a distributed LTK.
+        */
+       if (ltk->type == HCI_SMP_STK_SLAVE) {
                list_del(&ltk->list);
                kfree(ltk);
        }