From 072b962b81775604cf8297b782f87bf3b2802109 Mon Sep 17 00:00:00 2001
From: Ray <104485059+973212983@users.noreply.github.com>
Date: Mon, 17 Nov 2025 15:21:38 +0800
Subject: [PATCH] =?UTF-8?q?fix(=E2=80=8Eencoding/gjson):=20fix=20gjson=20d?=
 =?UTF-8?q?ata=20race=20(#4510)?=
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---
 encoding/gjson/gjson_api.go | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/encoding/gjson/gjson_api.go b/encoding/gjson/gjson_api.go
index 63c75ee28..f00c9e3c8 100644
--- a/encoding/gjson/gjson_api.go
+++ b/encoding/gjson/gjson_api.go
@@ -142,6 +142,8 @@ func (j *Json) Contains(pattern string) bool {
 // The target value by `pattern` should be type of slice or map.
 // It returns -1 if the target value is not found, or its type is invalid.
 func (j *Json) Len(pattern string) int {
+	j.mu.RLock()
+	defer j.mu.RUnlock()
 	p := j.getPointerByPattern(pattern)
 	if p != nil {
 		switch (*p).(type) {