Bluetooth: hci_event: Add missing locking on hdev in hci_le_ext_adv_term_evt

Both hci_find_adv_instance and hci_remove_adv_instance have a comment
above their function definition saying that these two functions require
the caller to hold the hdev->lock lock. However, hci_le_ext_adv_term_evt
does not acquire that lock and neither does its caller hci_le_meta_evt
(hci_le_meta_evt calls hci_le_ext_adv_term_evt via an indirect function
call because of the lookup in hci_le_ev_table).

The other event handlers all acquire and release the hdev->lock and they
follow the rule that hci_find_adv_instance and hci_remove_adv_instance
must be called while holding the hdev->lock lock.

The solution is to make sure hci_le_ext_adv_term_evt also acquires and
releases the hdev->lock lock. The check on ev->status which logs a
warning and does an early return is not covered by the lock because
other functions also access ev->status without holding the lock.

Signed-off-by: Niels Dossche <niels.dossche@ugent.be>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index 63b9259..4888c1f 100644 (file)
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -5716,8 +5716,6 @@ static void hci_le_ext_adv_term_evt(struct hci_dev *hdev, void *data,
 
        bt_dev_dbg(hdev, "status 0x%2.2x", ev->status);
 
-       adv = hci_find_adv_instance(hdev, ev->handle);
-
        /* The Bluetooth Core 5.3 specification clearly states that this event
         * shall not be sent when the Host disables the advertising set. So in
         * case of HCI_ERROR_CANCELLED_BY_HOST, just ignore the event.
@@ -5730,9 +5728,13 @@ static void hci_le_ext_adv_term_evt(struct hci_dev *hdev, void *data,
                return;
        }
 
+       hci_dev_lock(hdev);
+
+       adv = hci_find_adv_instance(hdev, ev->handle);
+
        if (ev->status) {
                if (!adv)
-                       return;
+                       goto unlock;
 
                /* Remove advertising as it has been terminated */
                hci_remove_adv_instance(hdev, ev->handle);
@@ -5740,12 +5742,12 @@ static void hci_le_ext_adv_term_evt(struct hci_dev *hdev, void *data,
 
                list_for_each_entry_safe(adv, n, &hdev->adv_instances, list) {
                        if (adv->enabled)
-                               return;
+                               goto unlock;
                }
 
                /* We are no longer advertising, clear HCI_LE_ADV */
                hci_dev_clear_flag(hdev, HCI_LE_ADV);
-               return;
+               goto unlock;
        }
 
        if (adv)
@@ -5760,16 +5762,19 @@ static void hci_le_ext_adv_term_evt(struct hci_dev *hdev, void *data,
 
                if (hdev->adv_addr_type != ADDR_LE_DEV_RANDOM ||
                    bacmp(&conn->resp_addr, BDADDR_ANY))
-                       return;
+                       goto unlock;
 
                if (!ev->handle) {
                        bacpy(&conn->resp_addr, &hdev->random_addr);
-                       return;
+                       goto unlock;
                }
 
                if (adv)
                        bacpy(&conn->resp_addr, &adv->random_addr);
        }
+
+unlock:
+       hci_dev_unlock(hdev);
 }
 
 static void hci_le_conn_update_complete_evt(struct hci_dev *hdev, void *data,