From 034bc4669ffe92b95155c8331334f47fa8bb4333 Mon Sep 17 00:00:00 2001 From: rjl493456442 Date: Mon, 19 Feb 2024 14:25:53 +0800 Subject: [PATCH] ethstats: prevent panic if head block is not available (#29020) This pull request fixes a flaw in ethstats which can lead to node crash A panic could happens when the local blockchain is reorging which causes the original head block not to be reachable (since number->hash canonical mapping is deleted). In order to prevent the panic, the block nilness is now checked in ethstats. --- ethstats/ethstats.go | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/ethstats/ethstats.go b/ethstats/ethstats.go index 29559991b..61ceec443 100644 --- a/ethstats/ethstats.go +++ b/ethstats/ethstats.go @@ -611,6 +611,10 @@ func (s *Service) reportBlock(conn *connWrapper, block *types.Block) error { // Gather the block details from the header or block chain details := s.assembleBlockStats(block) + // Short circuit if the block detail is not available. + if details == nil { + return nil + } // Assemble the block report and send it to the server log.Trace("Sending new block to ethstats", "number", details.Number, "hash", details.Hash) @@ -638,10 +642,16 @@ func (s *Service) assembleBlockStats(block *types.Block) *blockStats { // check if backend is a full node fullBackend, ok := s.backend.(fullNodeBackend) if ok { + // Retrieve current chain head if no block is given. if block == nil { head := fullBackend.CurrentBlock() block, _ = fullBackend.BlockByNumber(context.Background(), rpc.BlockNumber(head.Number.Uint64())) } + // Short circuit if no block is available. It might happen when + // the blockchain is reorging. + if block == nil { + return nil + } header = block.Header() td = fullBackend.GetTd(context.Background(), header.Hash())