From f88c333c37f5b2a741138dcb8a6e826ff8c72c28 Mon Sep 17 00:00:00 2001
From: Tsahi Zidenberg <tsahi@offchainlabs.com>
Date: Thu, 30 May 2024 09:54:31 -0600
Subject: [PATCH] MessageFromTxes: check l2message length

We should never hit this, but since this is a static rule we should check it in encoding and not just decoding.
---
 execution/gethexec/executionengine.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/execution/gethexec/executionengine.go b/execution/gethexec/executionengine.go
index 3ef894d402..e841a93529 100644
--- a/execution/gethexec/executionengine.go
+++ b/execution/gethexec/executionengine.go
@@ -234,6 +234,9 @@ func MessageFromTxes(header *arbostypes.L1IncomingMessageHeader, txes types.Tran
 			l2Message = append(l2Message, txBytes...)
 		}
 	}
+	if len(l2Message) > arbostypes.MaxL2MessageSize {
+		return nil, errors.New("l2message too long")
+	}
 	return &arbostypes.L1IncomingMessage{
 		Header: header,
 		L2msg:  l2Message,