Bluetooth: hci_h4: Fix padding calculation error within h4_recv_buf()

it is erroneous to calculate padding by subtracting length of type
indication from skb->len, it will cause data analysis error for
alignment which is greater than 1, so fixed by adding length of type
indication with skb->len.

Signed-off-by: Zijun Hu <quic_zijuhu@quicinc.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

diff --git a/drivers/bluetooth/hci_h4.c b/drivers/bluetooth/hci_h4.c
index 4b3b14a..1d0cdf0 100644 (file)
--- a/drivers/bluetooth/hci_h4.c
+++ b/drivers/bluetooth/hci_h4.c
@@ -252,7 +252,7 @@ struct sk_buff *h4_recv_buf(struct hci_dev *hdev, struct sk_buff *skb,
                        }
 
                        if (!dlen) {
-                               hu->padding = (skb->len - 1) % alignment;
+                               hu->padding = (skb->len + 1) % alignment;
                                hu->padding = (alignment - hu->padding) % alignment;
 
                                /* No more data, complete frame */
@@ -260,7 +260,7 @@ struct sk_buff *h4_recv_buf(struct hci_dev *hdev, struct sk_buff *skb,
                                skb = NULL;
                        }
                } else {
-                       hu->padding = (skb->len - 1) % alignment;
+                       hu->padding = (skb->len + 1) % alignment;
                        hu->padding = (alignment - hu->padding) % alignment;
 
                        /* Complete frame */