From 96d19ca2eef4bed201c5b1175ed013bc3122a001 Mon Sep 17 00:00:00 2001
From: itchyny <itchyny@cybozu.co.jp>
Date: Sun, 18 May 2025 08:06:54 +0900
Subject: [PATCH] Fix use of uninitialized value in check_literal (fix #3316)
 (#3324)

---
 src/jv_parse.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/jv_parse.c b/src/jv_parse.c
index 0c50c67c..741823ad 100644
--- a/src/jv_parse.c
+++ b/src/jv_parse.c
@@ -516,7 +516,7 @@ static pfunc check_literal(struct jv_parser* p) {
     return "Invalid string literal; expected \", but got '";
   case 'n':
     // if it starts with 'n', it could be a literal "nan"
-    if (p->tokenbuf[1] == 'u') {
+    if (p->tokenpos > 1 && p->tokenbuf[1] == 'u') {
       pattern = "null"; plen = 4; v = jv_null();
     }
   }