From b782d902e63e7046b2a0f6b32cb129ef328fe9c2 Mon Sep 17 00:00:00 2001
From: Jeffrey Pfau <jeffrey@endrift.com>
Date: Sun, 7 Feb 2016 09:16:25 -0800
Subject: [PATCH] GB Memory: Fix bank switching overflow case

---
 src/gb/memory.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/gb/memory.c b/src/gb/memory.c
index e85062663..9103dd9e8 100644
--- a/src/gb/memory.c
+++ b/src/gb/memory.c
@@ -314,7 +314,8 @@ static void _switchBank(struct GBMemory* memory, int bank) {
 	size_t bankStart = bank * GB_SIZE_CART_BANK0;
 	if (bankStart + GB_SIZE_CART_BANK0 > memory->romSize) {
 		mLOG(GB_MBC, GAME_ERROR, "Attempting to switch to an invalid ROM bank: %0X", bank);
-		return;
+		bankStart &= (GB_SIZE_CART_BANK0 - 1);
+		bank /= GB_SIZE_CART_BANK0;
 	}
 	memory->romBank = &memory->rom[bankStart];
 	memory->currentBank = bank;