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

commit 629b49c848ee71244203934347bd7730b0ddee8d upstream.

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

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 d67ddc92f82e3602bb6bf0011acce8cce47ffe62..2b4a7cf03041b6182e38797a2e2c6fc4a280b9d2 100644 (file)
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -3948,6 +3948,9 @@ static void hci_inquiry_result_with_rssi_evt(struct hci_dev *hdev,
                struct inquiry_info_with_rssi_and_pscan_mode *info;
                info = (void *) (skb->data + 1);
 
+               if (skb->len < num_rsp * sizeof(*info) + 1)
+                       goto unlock;
+
                for (; num_rsp; num_rsp--, info++) {
                        u32 flags;
 
@@ -3969,6 +3972,9 @@ static void hci_inquiry_result_with_rssi_evt(struct hci_dev *hdev,
        } else {
                struct inquiry_info_with_rssi *info = (void *) (skb->data + 1);
 
+               if (skb->len < num_rsp * sizeof(*info) + 1)
+                       goto unlock;
+
                for (; num_rsp; num_rsp--, info++) {
                        u32 flags;
 
@@ -3989,6 +3995,7 @@ static void hci_inquiry_result_with_rssi_evt(struct hci_dev *hdev,
                }
        }
 
+unlock:
        hci_dev_unlock(hdev);
 }