Bluetooth: Prevent out-of-bounds read in hci_inquiry_result_evt()

commit 75bbd2ea50ba1c5d9da878a17e92eac02fe0fd3a upstream.

Check `num_rsp` before using it as for-loop counter.

Cc: stable@vger.kernel.org
Signed-off-by: Peilin Ye <yepeilin.cs@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index b398272bc7290da08cc7aa4d20727e01e173928d..975f73b5833034d93ca56d65d99b797298676fea 100644 (file)
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -2094,7 +2094,7 @@ static void hci_inquiry_result_evt(struct hci_dev *hdev, struct sk_buff *skb)
 
        BT_DBG("%s num_rsp %d", hdev->name, num_rsp);
 
-       if (!num_rsp)
+       if (!num_rsp || skb->len < num_rsp * sizeof(*info) + 1)
                return;
 
        if (hci_dev_test_flag(hdev, HCI_PERIODIC_INQ))