merge revision(s) 62040: [Backport #14388]

	string.c: clear substring code range

	* string.c (str_substr): substring of broken code range string may
	  be valid or broken.  patch by tommy (Masahiro Tomita) at
	  [ruby-dev:50430] [Bug #14388].

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_4@62875 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 0 deletions

diff --git a/string.c b/string.c
index 0a5f802452..c065a8e2b6 100644
--- a/string.c
+++ b/string.c
@@ -2451,6 +2451,7 @@ str_substr(VALUE str, long beg, long len, int empty)
 	str2 = str_new_shared(rb_obj_class(str2), str2);
 	RSTRING(str2)->as.heap.ptr += ofs;
 	RSTRING(str2)->as.heap.len = len;
+	ENC_CODERANGE_CLEAR(str2);
     }
     else {
 	if (!len && !empty) return Qnil;