From a0821506bc5aacf7740dfd7c405e3308c56a6fab Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ra=C3=BAl=20Kripalani?= <raul@protocol.ai>
Date: Wed, 8 Mar 2023 20:49:28 +0000
Subject: [PATCH] Eth API: fail when requesting future epochs.

---
 node/impl/full/eth.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/node/impl/full/eth.go b/node/impl/full/eth.go
index 7af9e7000..919380ad1 100644
--- a/node/impl/full/eth.go
+++ b/node/impl/full/eth.go
@@ -254,6 +254,9 @@ func (a *EthModule) parseBlkParam(ctx context.Context, blkParam string, strict b
 		if err != nil {
 			return nil, fmt.Errorf("cannot parse block number: %v", err)
 		}
+		if abi.ChainEpoch(num) > head.Height()-1 {
+			return nil, fmt.Errorf("requested a future epoch (beyond 'latest')")
+		}
 		ts, err := a.Chain.GetTipsetByHeight(ctx, abi.ChainEpoch(num), nil, true)
 		if err != nil {
 			return nil, fmt.Errorf("cannot get tipset at height: %v", num)