From ee5692de1544687436b4ed19a0d23c6084b13f17 Mon Sep 17 00:00:00 2001
From: Jim McDonald <Jim@mcdee.net>
Date: Tue, 30 Jul 2024 15:45:46 +0100
Subject: [PATCH] Additional bounds checks.

---
 spec/fork.go            | 4 ++++
 spec/transactiontype.go | 4 ++++
 2 files changed, 8 insertions(+)

diff --git a/spec/fork.go b/spec/fork.go
index dc5f97f..b30bccf 100644
--- a/spec/fork.go
+++ b/spec/fork.go
@@ -73,5 +73,9 @@ func (d *Fork) UnmarshalJSON(input []byte) error {
 
 // String returns a string representation of the item.
 func (d Fork) String() string {
+	if int(d) < 0 || int(d) >= len(forkStrings) {
+		return "unknown"
+	}
+
 	return forkStrings[d]
 }
diff --git a/spec/transactiontype.go b/spec/transactiontype.go
index d453aa6..87899f2 100644
--- a/spec/transactiontype.go
+++ b/spec/transactiontype.go
@@ -64,5 +64,9 @@ func (d *TransactionType) UnmarshalJSON(input []byte) error {
 
 // String returns a string representation of the item.
 func (d TransactionType) String() string {
+	if int(d) < 0 || int(d) >= len(transactionTypeStrings) {
+		return "unknown"
+	}
+
 	return transactionTypeStrings[d]
 }