From 1de1bfef55f54767e2ef4fc4c96a9de71a46ef8c Mon Sep 17 00:00:00 2001
From: divVerent <divVerent@gmail.com>
Date: Sat, 26 Mar 2022 02:41:59 -0400
Subject: [PATCH] internal/gamepad: fix uint16 underflow handling in gamepads.
 (#2030)

Fixes crash where Ebiten considers a keyboard a gamepad with way too many buttons.

Updates #2027
---
 internal/gamepad/gamepad_linux.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/internal/gamepad/gamepad_linux.go b/internal/gamepad/gamepad_linux.go
index 5a338f6fa..64b53ad28 100644
--- a/internal/gamepad/gamepad_linux.go
+++ b/internal/gamepad/gamepad_linux.go
@@ -328,7 +328,7 @@ func (g *nativeGamepad) update(gamepad *gamepads) error {
 
 		switch e.typ {
 		case unix.EV_KEY:
-			if int(e.code)-_BTN_MISC < len(g.keyMap) {
+			if int(e.code-_BTN_MISC) < len(g.keyMap) {
 				idx := g.keyMap[e.code-_BTN_MISC]
 				g.buttons[idx] = e.value != 0
 			}