Re: [syzbot] [bluetooth?] KASAN: slab-use-after-free Read in mgmt_pending_remove

[Edward Adam Davis]

#syz test

diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
index 262bf984d2aa..33e725798c34 100644
--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -9474,7 +9474,9 @@ void mgmt_index_removed(struct hci_dev *hdev)
 	if (hci_test_quirk(hdev, HCI_QUIRK_RAW_DEVICE))
 		return;
 
+	hci_dev_lock(hdev);
 	mgmt_pending_foreach(0, hdev, true, cmd_complete_rsp, &match);
+	hci_dev_unlock(hdev);
 
 	if (hci_dev_test_flag(hdev, HCI_UNCONFIGURED)) {
 		mgmt_index_event(MGMT_EV_UNCONF_INDEX_REMOVED, hdev, NULL, 0,