From: Gustavo A. R. Silva <gustavo@embeddedor.com>
Date: Fri, 8 Feb 2019 00:40:33 +0000 (-0600)
Subject: Bluetooth: hci_event: Use struct_size() helper
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=16e183423f1a3aeb603d7648d2ca3a578d5a9941;p=openwrt%2Fstaging%2Fblogic.git

Bluetooth: hci_event: Use struct_size() helper

Make use of the struct_size() helper instead of an open-coded version
in order to avoid any potential type mistakes, in particular in the
context in which this code is being used.

So, change the following form:

sizeof(*ev) + ev->num_hndl * sizeof(struct hci_comp_pkts_info)

 to :

struct_size(ev, handles, ev->num_hndl)

This code was detected with the help of Coccinelle.

Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
---

diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index ac2826ce162b..609fd6871c5a 100644
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -3556,8 +3556,8 @@ static void hci_num_comp_pkts_evt(struct hci_dev *hdev, struct sk_buff *skb)
 		return;
 	}
 
-	if (skb->len < sizeof(*ev) || skb->len < sizeof(*ev) +
-	    ev->num_hndl * sizeof(struct hci_comp_pkts_info)) {
+	if (skb->len < sizeof(*ev) ||
+	    skb->len < struct_size(ev, handles, ev->num_hndl)) {
 		BT_DBG("%s bad parameters", hdev->name);
 		return;
 	}
@@ -3644,8 +3644,8 @@ static void hci_num_comp_blocks_evt(struct hci_dev *hdev, struct sk_buff *skb)
 		return;
 	}
 
-	if (skb->len < sizeof(*ev) || skb->len < sizeof(*ev) +
-	    ev->num_hndl * sizeof(struct hci_comp_blocks_info)) {
+	if (skb->len < sizeof(*ev) ||
+	    skb->len < struct_size(ev, handles, ev->num_hndl)) {
 		BT_DBG("%s bad parameters", hdev->name);
 		return;
 	}