From 6a3cd371d01e5d253b0ab999da53d87ac84ab7cc Mon Sep 17 00:00:00 2001
From: Lior Halphon <LIJI32@gmail.com>
Date: Wed, 3 Jun 2020 20:54:06 +0300
Subject: [PATCH] Fix potential memory corruption when execution malformed ROMs

---
 Core/mbc.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/Core/mbc.c b/Core/mbc.c
index 72073f6..ba5055f 100644
--- a/Core/mbc.c
+++ b/Core/mbc.c
@@ -135,7 +135,10 @@ void GB_configure_cart(GB_gameboy_t *gb)
             static const unsigned ram_sizes[256] = {0, 0x800, 0x2000, 0x8000, 0x20000, 0x10000};
             gb->mbc_ram_size = ram_sizes[gb->rom[0x149]];
         }
-        gb->mbc_ram = malloc(gb->mbc_ram_size);
+        
+        if (gb->mbc_ram_size) {
+            gb->mbc_ram = malloc(gb->mbc_ram_size);
+        }
 
         /* Todo: Some games assume unintialized MBC RAM is 0xFF. It this true for all cartridges types? */
         memset(gb->mbc_ram, 0xFF, gb->mbc_ram_size);