From 1000289796ea4f19cd7d5dec7b312f5829d58f86 Mon Sep 17 00:00:00 2001
From: Vadim Zhestikov <v.zhestikov@f5.com>
Date: Mon, 24 Oct 2022 07:48:28 -0700
Subject: [PATCH] Fixed labeled empty statement.

This fixes #593 issue on Github.
---
 src/njs_parser.c         | 46 +++++++++++++++++++++-------------------
 src/test/njs_unit_test.c |  3 +++
 2 files changed, 27 insertions(+), 22 deletions(-)

diff --git a/src/njs_parser.c b/src/njs_parser.c
index 05cfaf17..2b94d3d4 100644
--- a/src/njs_parser.c
+++ b/src/njs_parser.c
@@ -4701,39 +4701,41 @@ njs_parser_statement_after(njs_parser_t *parser, njs_lexer_token_t *token,
 
     new_node = parser->node;
 
-    if (new_node->hoist) {
-        child = &njs_parser_chain_top(parser);
+    if (new_node != NULL) {
+        if (new_node->hoist) {
+            child = &njs_parser_chain_top(parser);
 
-        while (*child != NULL) {
-            node = *child;
+            while (*child != NULL) {
+                node = *child;
 
-            if (node->hoist) {
-                break;
+                if (node->hoist) {
+                    break;
+                }
+
+                child = &node->left;
             }
 
-            child = &node->left;
+            last = *child;
         }
 
-        last = *child;
-    }
-
-    stmt = njs_parser_node_new(parser, NJS_TOKEN_STATEMENT);
-    if (njs_slow_path(stmt == NULL)) {
-        return NJS_ERROR;
-    }
+        stmt = njs_parser_node_new(parser, NJS_TOKEN_STATEMENT);
+        if (njs_slow_path(stmt == NULL)) {
+            return NJS_ERROR;
+        }
 
-    stmt->hoist = new_node->hoist;
-    stmt->left = last;
-    stmt->right = new_node;
+        stmt->hoist = new_node->hoist;
+        stmt->left = last;
+        stmt->right = new_node;
 
-    *child = stmt;
+        *child = stmt;
 
-    top = (child != &parser->target) ? njs_parser_chain_top(parser)
-                                     : stmt;
+        top = (child != &parser->target) ? njs_parser_chain_top(parser)
+                                         : stmt;
 
-    parser->node = top;
+        parser->node = top;
 
-    njs_parser_chain_top_set(parser, top);
+       njs_parser_chain_top_set(parser, top);
+    }
 
     return njs_parser_stack_pop(parser);
 }
diff --git a/src/test/njs_unit_test.c b/src/test/njs_unit_test.c
index b8818b44..35614708 100644
--- a/src/test/njs_unit_test.c
+++ b/src/test/njs_unit_test.c
@@ -3159,6 +3159,9 @@ static njs_unit_test_t  njs_test[] =
     { njs_str("a:\n\n1"),
       njs_str("1") },
 
+    { njs_str("a:;"),
+      njs_str("undefined") },
+
     { njs_str("a:\n\n"),
       njs_str("SyntaxError: Unexpected end of input in 3") },
 
-- 
2.47.3