[PATCH] HID: lenovo: Fix buffer over-read in X12 Tab raw_event handler

[Kean <rh_king@163.com>]

In lenovo_raw_event(), the X12 Tab keyboard handler reads a 4-byte
little-endian value via *(__le32 *)data but only guards the access
with a size >= 3 check.  If a 3-byte report with ID 0x03 is received,
the code reads one byte beyond the end of the buffer.

Change the size check to >= 4 to match the actual access width.

Signed-off-by: Kean <rh_king@163.com>
---
 drivers/hid/hid-lenovo.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/hid/hid-lenovo.c b/drivers/hid/hid-lenovo.c
index a6b73e03c16b..4686ecb6cfa8 100644
--- a/drivers/hid/hid-lenovo.c
+++ b/drivers/hid/hid-lenovo.c
@@ -793,7 +793,7 @@ static int lenovo_raw_event(struct hid_device *hdev,
 	 */
 	if (unlikely((hdev->product == USB_DEVICE_ID_LENOVO_X12_TAB
 			|| hdev->product == USB_DEVICE_ID_LENOVO_X12_TAB2)
-			&& size >= 3 && report->id == 0x03))
+			&& size >= 4 && report->id == 0x03))
 		return lenovo_raw_event_TP_X12_tab(hdev, le32_to_cpu(*(__le32 *)data));
 
 	return 0;
-- 
2.53.0