From aad200801cf7c07990afcb195b0cdc6cf1c7e417 Mon Sep 17 00:00:00 2001
From: Gabriel Ravier <gabravier@gmail.com>
Date: Fri, 31 Jan 2020 23:55:59 +0100
Subject: [PATCH] Removed UB in PutArmsEnergy

Signed-off-by: Gabriel Ravier <gabravier@gmail.com>
---
 src/MycParam.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/MycParam.cpp b/src/MycParam.cpp
index fbe30c0c..76ea7283 100644
--- a/src/MycParam.cpp
+++ b/src/MycParam.cpp
@@ -271,6 +271,9 @@ void PutArmsEnergy(BOOL flash)
 	RECT rcExpFlash = {40, 80, 80, 88};
 
 	int lv = gArmsData[gSelectedArms].level - 1;
+	if (lv < 0)	// Detect the case where the level is 0 (no weapon)
+		lv = 0;	// Set lv to a safe value
+
 	int arms_code = gArmsData[gSelectedArms].code;
 	int exp_now = gArmsData[gSelectedArms].exp;
 	int exp_next = gArmsLevelTable[arms_code].exp[lv];