From eef89f1c0214aa93cf26aa2fe7ed3971027fe3eb Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?P=C3=A9ter=20Szil=C3=A1gyi?= <peterke@gmail.com>
Date: Tue, 6 Jul 2021 12:38:52 +0300
Subject: [PATCH] core/types: sanity check the basefee length inside a header

---
 core/types/block.go | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/core/types/block.go b/core/types/block.go
index d189c86c2b01..360f1eb47c2b 100644
--- a/core/types/block.go
+++ b/core/types/block.go
@@ -129,6 +129,11 @@ func (h *Header) SanityCheck() error {
 	if eLen := len(h.Extra); eLen > 100*1024 {
 		return fmt.Errorf("too large block extradata: size %d", eLen)
 	}
+	if h.BaseFee != nil {
+		if bfLen := h.BaseFee.BitLen(); bfLen > 256 {
+			return fmt.Errorf("too large base fee: bitlen %d", bfLen)
+		}
+	}
 	return nil
 }