From: Alexander Borisov <alexander.borisov@nginx.com>
Date: Fri, 19 Jun 2020 16:48:12 +0000 (+0300)
Subject: Parser: fixed heap-use-after-free in optional chain.
X-Git-Tag: 0.4.2~21
X-Git-Url: http://git.kaiwu.me/postgresql/log/contrib/postgres_fdw/%7B@url%7D?a=commitdiff_plain;h=9ab210e3ada48506c5f1a32009717cb081e94b12;p=njs.git

Parser: fixed heap-use-after-free in optional chain.
---

diff --git a/src/njs_parser.c b/src/njs_parser.c
index 61d76c9d..9b4632d8 100644
--- a/src/njs_parser.c
+++ b/src/njs_parser.c
@@ -2881,10 +2881,6 @@ njs_parser_optional_chain(njs_parser_t *parser, njs_lexer_token_t *token,
         break;
 
     default:
-        if (!njs_lexer_token_is_identifier_name(token)) {
-            njs_lexer_consume_token(parser->lexer, 1);
-        }
-
         ret = njs_parser_property(parser, token, current);
 
         switch (ret) {
diff --git a/src/test/njs_unit_test.c b/src/test/njs_unit_test.c
index 2eef5c5a..b7052caf 100644
--- a/src/test/njs_unit_test.c
+++ b/src/test/njs_unit_test.c
@@ -17016,6 +17016,9 @@ static njs_unit_test_t  njs_test[] =
 
     { njs_str("{{} ({a: 1, b: {}\n}\n})\n}"),
       njs_str("SyntaxError: Unexpected token \"}\" in 3") },
+
+    { njs_str("object?."),
+      njs_str("SyntaxError: Unexpected end of input in 1") },
 };