linux-kernel - Re: [PATCH 1/1] Drivers: input: serio: New driver to support Hyper-V synthetic keyboard

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Date:	Mon, 16 Sep 2013 21:33:19 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	KY Srinivasan <kys@...rosoft.com>
Cc:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	"olaf@...fle.de" <olaf@...fle.de>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"jasowang@...hat.com" <jasowang@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"vojtech@...e.cz" <vojtech@...e.cz>,
	"linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
	"apw@...onical.com" <apw@...onical.com>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>
Subject: Re: [PATCH 1/1] Drivers: input: serio: New driver to support Hyper-V
 synthetic keyboard

Just roll something like the following into your patch.

regards,
dan carpenter

diff --git a/drivers/input/serio/hyperv-keyboard.c b/drivers/input/serio/hyperv-keyboard.c
index 0d4625f..262721b 100644
--- a/drivers/input/serio/hyperv-keyboard.c
+++ b/drivers/input/serio/hyperv-keyboard.c
@@ -151,15 +151,18 @@ static void hv_kbd_free_device(struct hv_kbd_dev *device)
 }
 
 static void hv_kbd_on_receive(struct hv_device *device,
-				struct vmpacket_descriptor *packet)
+			      struct vmpacket_descriptor *packet, size_t size)
 {
 	struct synth_kbd_msg *msg;
 	struct hv_kbd_dev *kbd_dev = hv_get_drvdata(device);
 	struct synth_kbd_keystroke *ks_msg;
+	int offset;
 	u16 scan_code;
 
-	msg = (struct synth_kbd_msg *)((unsigned long)packet +
-					(packet->offset8 << 3));
+	offset = packet->offset8 << 3;
+	if (offset + sizeof(struct synth_kbd_protocol_response) > size)
+		return;
+	msg = (void *)packet + offset;
 
 	switch (msg->header.type) {
 	case SYNTH_KBD_PROTOCOL_RESPONSE:
@@ -220,7 +223,7 @@ static void hv_kbd_on_channel_callback(void *context)
 				break;
 
 			case VM_PKT_DATA_INBAND:
-				hv_kbd_on_receive(device, desc);
+				hv_kbd_on_receive(device, desc, bytes_recvd);
 				break;
 
 			default:
--
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