From 19085392a26cbb7409d353d8d67e09a0b31242fa Mon Sep 17 00:00:00 2001
From: Daniel Liu <liudaniel@qq.com>
Date: Tue, 14 Jan 2025 10:56:14 +0800
Subject: [PATCH] accounts/abi: return error on fixed bytes with size larger
 than 32 bytes (#26075)

* fixed bytes with size larger than 32 bytes is not allowed

* add testcase
---
 accounts/abi/type.go      | 3 +++
 accounts/abi/type_test.go | 7 +++++++
 2 files changed, 10 insertions(+)

diff --git a/accounts/abi/type.go b/accounts/abi/type.go
index f0c682cebd..d50903e4c1 100644
--- a/accounts/abi/type.go
+++ b/accounts/abi/type.go
@@ -153,6 +153,9 @@ func NewType(t string, internalType string, components []ArgumentMarshaling) (ty
 		if varSize == 0 {
 			typ.T = BytesTy
 		} else {
+			if varSize > 32 {
+				return Type{}, fmt.Errorf("unsupported arg type: %s", t)
+			}
 			typ.T = FixedBytesTy
 			typ.Size = varSize
 		}
diff --git a/accounts/abi/type_test.go b/accounts/abi/type_test.go
index e6b08b4878..cd2577b793 100644
--- a/accounts/abi/type_test.go
+++ b/accounts/abi/type_test.go
@@ -366,3 +366,10 @@ func TestGetTypeSize(t *testing.T) {
 		}
 	}
 }
+
+func TestNewFixedBytesOver32(t *testing.T) {
+	_, err := NewType("bytes4096", "", nil)
+	if err == nil {
+		t.Errorf("fixed bytes with size over 32 is not spec'd")
+	}
+}