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

1 files changed, 1 insertions, 1 deletions

diff --git a/string.c b/string.c
index c38741f611..f7e9c3d46c 100644
--- a/string.c
+++ b/string.c
@@ -5087,7 +5087,7 @@ rb_str_sub_bang(int argc, VALUE *argv, VALUE str)
 	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));