core: return error if repair block failed (#18126)

* core: return error if repair block failed * make error a bit shorter
ethereum · Nov 23, 2018 · 2a113f6 · 2a113f6
1 parent b24ef5e
commit 2a113f6
Showing 1 changed file with 5 additions and 1 deletion.
diff --git a/core/blockchain.go b/core/blockchain.go
@@ -445,7 +445,11 @@ func (bc *BlockChain) repair(head **types.Block) error {
 			return nil
 		}
 		// Otherwise rewind one block and recheck state availability there
-		(*head) = bc.GetBlock((*head).ParentHash(), (*head).NumberU64()-1)
+		block := bc.GetBlock((*head).ParentHash(), (*head).NumberU64()-1)
+		if block == nil {
+			return fmt.Errorf("missing block %d [%x]", (*head).NumberU64()-1, (*head).ParentHash())
+		}
+		(*head) = block
 	}
 }