Syzbot hit warning in hci_conn_del() caused by freeing handle that was not allocated using ida allocator. This is caused by handle bigger than HCI_CONN_HANDLE_MAX passed by hci_le_big_sync_established_evt(), which makes code think it's unset connection. Add same check for handle upper bound as in hci_conn_set_handle() to prevent warning. Fixes: https://syzkaller.appspot.com/bug?extid=b2545b087a01a7319474 Reported-by: syzbot+b2545b087a01a7319474@xxxxxxxxxxxxxxxxxxxxxxxxx Fixes: 181a42edddf5 ("Bluetooth: Make handle of hci_conn be unique") Signed-off-by: Pavel Skripkin <paskripkin@xxxxxxxxx> --- net/bluetooth/hci_conn.c | 15 ++++++++++++--- 1 file changed, 12 insertions(+), 3 deletions(-) diff --git a/net/bluetooth/hci_conn.c b/net/bluetooth/hci_conn.c index 0c76dcde5361..080053a85b4d 100644 --- a/net/bluetooth/hci_conn.c +++ b/net/bluetooth/hci_conn.c @@ -899,8 +899,8 @@ static int hci_conn_hash_alloc_unset(struct hci_dev *hdev) U16_MAX, GFP_ATOMIC); } -struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst, - u8 role, u16 handle) +static struct hci_conn *__hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst, + u8 role, u16 handle) { struct hci_conn *conn; @@ -1041,7 +1041,16 @@ struct hci_conn *hci_conn_add_unset(struct hci_dev *hdev, int type, if (unlikely(handle < 0)) return ERR_PTR(-ECONNREFUSED); - return hci_conn_add(hdev, type, dst, role, handle); + return __hci_conn_add(hdev, type, dst, role, handle); +} + +struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst, + u8 role, u16 handle) +{ + if (handle > HCI_CONN_HANDLE_MAX) + return ERR_PTR(-EINVAL); + + return __hci_conn_add(hdev, type, dst, role, handle); } static void hci_conn_cleanup_child(struct hci_conn *conn, u8 reason) -- 2.45.2
