From b3e1c297c8e0ab2e62b3a5068576d94f0e0585ab Mon Sep 17 00:00:00 2001
From: zhiqiangxu <652732310@qq.com>
Date: Mon, 21 Aug 2023 05:02:33 +0000
Subject: [PATCH] `ForkChoice`: remove an impossible case for
 `parent_checkpoints` (#4626)

`parent_finalized.epoch + 1 > block_epoch` will never be `true` since as the comment says:

```
 A block in epoch `N` cannot contain attestations which would finalize an epoch higher than `N - 1`.
```
---
 consensus/fork_choice/src/fork_choice.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/consensus/fork_choice/src/fork_choice.rs b/consensus/fork_choice/src/fork_choice.rs
index b3749ea9d8..ea3a58127b 100644
--- a/consensus/fork_choice/src/fork_choice.rs
+++ b/consensus/fork_choice/src/fork_choice.rs
@@ -750,7 +750,7 @@ where
             .unrealized_justified_checkpoint
             .zip(parent_block.unrealized_finalized_checkpoint)
             .filter(|(parent_justified, parent_finalized)| {
-                parent_justified.epoch == block_epoch && parent_finalized.epoch + 1 >= block_epoch
+                parent_justified.epoch == block_epoch && parent_finalized.epoch + 1 == block_epoch
             });
 
         let (unrealized_justified_checkpoint, unrealized_finalized_checkpoint) = if let Some((