merge revision(s) 57098: [Backport #13042]

	re.c: non-regexp name reference

	* re.c (rb_reg_regsub): other than regexp has no name references.
  [ruby-core:78686] [Bug #13042]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_3@57349 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 2 insertions, 1 deletions

diff --git a/re.c b/re.c
index c1cf3d8762..20bbede103 100644
--- a/re.c
+++ b/re.c
@@ -3465,7 +3465,8 @@ rb_reg_regsub(VALUE str, VALUE src, struct re_registers *regs, VALUE regexp)
                 if (name_end < e) {
 		    VALUE n = rb_str_subseq(str, (long)(name - RSTRING_PTR(str)),
 					    (long)(name_end - name));
-		    if (!rb_enc_compatible(RREGEXP(regexp)->src, n) ||
+		    if (NIL_P(regexp) ||
+		        !rb_enc_compatible(RREGEXP(regexp)->src, n) ||
 			(no = name_to_backref_number(regs, regexp, name, name_end)) < 1) {
 			name_to_backref_error(n);
 		    }