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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