usb: kbd: Prevent out of bound access

Scan code 0x39 is CapsLock, which is not a printable character and thus
is not covered by either usb_kbd_numkey_shifted[] or usb_kbd_numkey[].
Fix the scan code check to avoid looking it up in either of the arrays.

Signed-off-by: Marek Vasut <marex@denx.de>

diff --git a/common/usb_kbd.c b/common/usb_kbd.c
index cbb1995de3398431878811f92f6e79551b947965..d84865fbbe26bb337d9453a86c03d8dbb06ae43d 100644 (file)
--- a/common/usb_kbd.c
+++ b/common/usb_kbd.c
@@ -199,7 +199,7 @@ static int usb_kbd_translate(struct usb_kbd_pdata *data, unsigned char scancode,
                }
        }
 
-       if ((scancode > 0x1d) && (scancode < 0x3a)) {
+       if ((scancode > 0x1d) && (scancode < 0x39)) {
                /* Shift pressed */
                if (modifier & (LEFT_SHIFT | RIGHT_SHIFT))
                        keycode = usb_kbd_numkey_shifted[scancode - 0x1e];