Bluetooth: Fix discovery filter when no RSSI is available

When no RSSI value is available then make sure that the result is
filtered out when the RSSI threshold filter is active.

This means that all Bluetooth 1.1 or earlier devices will not
report any results when using a RSSI threshold filter.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>

1 files changed, 8 insertions, 1 deletions

diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
index 326609fa3bda..3ca2818d1c8b 100644
--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -7006,9 +7006,12 @@ void mgmt_device_found(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 link_type,
          * if such a RSSI threshold is specified. If a RSSI threshold has
          * been specified, then all results with a RSSI smaller than the
          * RSSI threshold will be dropped.
+         *
+         * For BR/EDR devices (pre 1.2) providing no RSSI during inquiry,
+         * the results are also dropped.
          */
         if (hdev->discovery.rssi != HCI_RSSI_INVALID &&
-            rssi < hdev->discovery.rssi)
+            (rssi < hdev->discovery.rssi || rssi == HCI_RSSI_INVALID))
                 return;
 
         /* Make sure that the buffer is big enough. The 5 extra bytes
@@ -7019,6 +7022,10 @@ void mgmt_device_found(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 link_type,
 
         memset(buf, 0, sizeof(buf));
 
+        /* Reset invalid RSSI to 0 to keep backwards API compliance */
+        if (rssi == HCI_RSSI_INVALID)
+                rssi = 0;
+
         bacpy(&ev->addr.bdaddr, bdaddr);
         ev->addr.type = link_to_bdaddr(link_type, addr_type);
         ev->rssi = rssi;