merge revision(s) 61862: [Backport #14368]

	parse.y (new_regexp): Fix SEGV of `/#{"\u3042"}#{'{U+3044}'}/` in non UTF-8

	Mixing other encoding string literals in one Regexp caused SEGV.
	This bug was found by CoverityScan.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_4@62880 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

3 files changed, 8 insertions, 5 deletions

diff --git a/parse.y b/parse.y
index 8e50087c26..ec2b056358 100644
--- a/parse.y
+++ b/parse.y
@@ -9141,8 +9141,7 @@ new_regexp_gen(struct parser_params *parser, NODE *node, int options)
 		if (reg_fragment_check(tail, options) && prev && !NIL_P(prev->nd_lit)) {
 		    VALUE lit = prev == node ? prev->nd_lit : prev->nd_head->nd_lit;
 		    if (!literal_concat0(parser, lit, tail)) {
-			node = 0;
-			break;
+			return NEW_NIL(); /* dummy node on error */
 		    }
 		    rb_str_resize(tail, 0);
 		    prev->nd_next = list->nd_next;
diff --git a/test/ruby/test_mixed_unicode_escapes.rb b/test/ruby/test_mixed_unicode_escapes.rb
index 09240d8ab2..f0b4cc691f 100644
--- a/test/ruby/test_mixed_unicode_escapes.rb
+++ b/test/ruby/test_mixed_unicode_escapes.rb
@@ -13,14 +13,18 @@ class TestMixedUnicodeEscape < Test::Unit::TestCase
     # 8-bit character escapes are okay.
     assert_equal("B\xFF", "\u0042\xFF")
 
-    # sjis mb chars mixed with Unicode shound not work
+    # sjis mb chars mixed with Unicode should not work
     assert_raise(SyntaxError) { eval %q("�\u1234")}
     assert_raise(SyntaxError) { eval %q("\u{1234}�")}
 
+    # also should not work for Regexp
+    assert_raise(SyntaxError) { eval %q(/#{"\u1234"}#{"�"}/)}
+    assert_raise(RegexpError) { eval %q(/\u{1234}#{nil}�/)}
+    assert_raise(RegexpError) { eval %q(/�#{nil}\u1234/)}
+
     # String interpolation turns into an expression and we get
     # a different kind of error, but we still can't mix these
     assert_raise(Encoding::CompatibilityError) { eval %q("\u{1234}#{nil}�")}
     assert_raise(Encoding::CompatibilityError) { eval %q("�#{nil}\u1234")}
-
   end
 end
diff --git a/version.h b/version.h
index 46c1b8e13f..c4bd04f96f 100644
--- a/version.h
+++ b/version.h
@@ -1,6 +1,6 @@
 #define RUBY_VERSION "2.4.4"
 #define RUBY_RELEASE_DATE "2018-03-22"
-#define RUBY_PATCHLEVEL 280
+#define RUBY_PATCHLEVEL 281
 
 #define RUBY_RELEASE_YEAR 2018
 #define RUBY_RELEASE_MONTH 3