From 1480e0046f450d506fa63d04db2730de149750bd Mon Sep 17 00:00:00 2001
From: Masaaki Goshima <goccy54@gmail.com>
Date: Fri, 2 Dec 2022 01:51:29 +0900
Subject: [PATCH] Fix checkptr error for array decoder

---
 decode_test.go            | 10 ++++++++++
 internal/decoder/array.go |  4 +++-
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/decode_test.go b/decode_test.go
index 088367e..f139eae 100644
--- a/decode_test.go
+++ b/decode_test.go
@@ -4005,3 +4005,13 @@ func TestIssue384(t *testing.T) {
 		}
 	}
 }
+
+func TestIssue408(t *testing.T) {
+	type T struct {
+		Arr [2]int32 `json:"arr"`
+	}
+	var v T
+	if err := json.Unmarshal([]byte(`{"arr": [1,2]}`), &v); err != nil {
+		t.Fatal(err)
+	}
+}
diff --git a/internal/decoder/array.go b/internal/decoder/array.go
index 8ef91cf..4b23ed4 100644
--- a/internal/decoder/array.go
+++ b/internal/decoder/array.go
@@ -19,7 +19,9 @@ type arrayDecoder struct {
 }
 
 func newArrayDecoder(dec Decoder, elemType *runtime.Type, alen int, structName, fieldName string) *arrayDecoder {
-	zeroValue := *(*unsafe.Pointer)(unsafe_New(elemType))
+	// workaround to avoid checkptr errors. cannot use `*(*unsafe.Pointer)(unsafe_New(elemType))` directly.
+	zeroValuePtr := unsafe_New(elemType)
+	zeroValue := **(**unsafe.Pointer)(unsafe.Pointer(&zeroValuePtr))
 	return &arrayDecoder{
 		valueDecoder: dec,
 		elemType:     elemType,