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From: "Gustavo A. R. Silva" <gustavo@embeddedor.com>
To: Marcel Holtmann <marcel@holtmann.org>,
	Johan Hedberg <johan.hedberg@gmail.com>,
	"David S. Miller" <davem@davemloft.net>
Cc: linux-bluetooth@vger.kernel.org, netdev@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	"Gustavo A. R. Silva" <gustavo@embeddedor.com>
Subject: [PATCH][next] Bluetooth: hci_event: Use struct_size() helper
Date: Thu, 7 Feb 2019 18:40:33 -0600	[thread overview]
Message-ID: <20190208004033.GA15609@embeddedor> (raw)

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>
---
 net/bluetooth/hci_event.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

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;
 	}
-- 
2.20.1


             reply	other threads:[~2019-02-08  0:40 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-02-08  0:40 Gustavo A. R. Silva [this message]
2019-02-08  4:02 ` [PATCH][next] Bluetooth: hci_event: Use struct_size() helper Joe Perches
2019-02-18 13:00 ` Marcel Holtmann

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