For dual-mode controllers it is possible to disable BR/EDR and operate
as LE single mode controllers with a static random address. If that is
the case, then refuse switching BR/EDR back on after the controller has
been powered.
Signed-off-by: Marcel Holtmann <marcel@xxxxxxxxxxxx>
---
net/bluetooth/mgmt.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
index e531da805923..cae612658ba9 100644
--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -4683,6 +4683,21 @@ static int set_bredr(struct sock *sk, struct hci_dev *hdev, void *data, u16 len)
err = cmd_status(sk, hdev->id, MGMT_OP_SET_BREDR,
MGMT_STATUS_REJECTED);
goto unlock;
+ } else {
+ /* When configuring a dual-mode controller to operate
+ * with LE only and using a static address, then switching
+ * BR/EDR back on is not allowed.
+ *
+ * Dual-mode controllers shall operate with the public
+ * address as its identity address for BR/EDR and LE. So
+ * reject the attempt to create an invalid configuration.
+ */
+ if (!test_bit(HCI_BREDR_ENABLED, &hdev->dev_flags) &&
+ bacmp(&hdev->static_addr, BDADDR_ANY)) {
+ err = cmd_status(sk, hdev->id, MGMT_OP_SET_BREDR,
+ MGMT_STATUS_REJECTED);
+ goto unlock;
+ }
}
if (mgmt_pending_find(MGMT_OP_SET_BREDR, hdev)) {
--
2.1.0
--
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