https://git.ruby-lang.org/ruby.git/commit/?id=ec1666eb20

From ec1666eb20e2fee6e96c9d05ccf69e2d13f0ca92 Mon Sep 17 00:00:00 2001
From: nagachika <nagachika@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Fri, 9 Aug 2019 13:42:26 +0000
Subject: merge revision(s) 8f51da5d41f0642d5a971e4223d1ba14643c6398: [Backport
 #15946]

	Get rid of undefined behavior

	* string.c (rb_str_sub_bang): str and repl can be same.
	  [Bug #15946]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_6@67739 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

diff --git a/string.c b/string.c
index c38741f..f7e9c3d 100644
--- a/string.c
+++ b/string.c
@@ -5087,7 +5087,7 @@ rb_str_sub_bang(int argc, VALUE *argv, VALUE str) https://github.com/ruby/ruby/blob/trunk/string.c#L5087
 	if (rlen != plen) {
 	    memmove(p + beg0 + rlen, p + beg0 + plen, len - beg0 - plen);
 	}
-	memcpy(p + beg0, rp, rlen);
+	memmove(p + beg0, rp, rlen);
 	len += rlen - plen;
 	STR_SET_LEN(str, len);
 	TERM_FILL(&RSTRING_PTR(str)[len], TERM_LEN(str));
diff --git a/version.h b/version.h
index 67f60ed..4059e38 100644
--- a/version.h
+++ b/version.h
@@ -1,6 +1,6 @@ https://github.com/ruby/ruby/blob/trunk/version.h#L1
 #define RUBY_VERSION "2.6.3"
 #define RUBY_RELEASE_DATE RUBY_RELEASE_YEAR_STR"-"RUBY_RELEASE_MONTH_STR"-"RUBY_RELEASE_DAY_STR
-#define RUBY_PATCHLEVEL 89
+#define RUBY_PATCHLEVEL 90
 
 #define RUBY_RELEASE_YEAR 2019
 #define RUBY_RELEASE_MONTH 8
-- 
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