https://git.ruby-lang.org/ruby.git/commit/?id=91af5542b5

From 91af5542b503054ea059b6c4faa5cd821784774a Mon Sep 17 00:00:00 2001
From: Takashi Kokubun <takashikkbn@g...>
Date: Sun, 1 Dec 2019 02:00:08 -0800
Subject: Fix a mistake excluding NULL in the end


diff --git a/mjit.c b/mjit.c
index f062b4b..f0b66d3 100644
--- a/mjit.c
+++ b/mjit.c
@@ -730,10 +730,10 @@ split_flags(char *flags) https://github.com/ruby/ruby/blob/trunk/mjit.c#L730
             next++; // skip space
         }
     }
-    buf[i] = NULL;
 
-    char **ret = xmalloc(sizeof(char **) * i);
+    char **ret = xmalloc(sizeof(char **) * (i + 1));
     memcpy((void *)ret, buf, sizeof(char **) * i);
+    ret[i] = NULL;
     return ret;
 }
 
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