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core: validate chain before writing block to avoid race condition #1319

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core: validate chain before writing block to avoid race condition #1319

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14 changes: 14 additions & 0 deletions core/blockchain.go
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Original file line number Diff line number Diff line change
Expand Up @@ -2230,6 +2230,20 @@ func (bc *BlockChain) insertChain(chain types.Blocks, setHead bool) (int, error)
status WriteStatus
)

// Before the actual db insertion happens, verify the block against the whitelisted
// milestone and checkpoint. This is to prevent a race condition where a milestone
// or checkpoint was whitelisted while the block execution happened (and wasn't
// available sometime before) and the block turns out to be inavlid (i.e. not
// honouring the milestone or checkpoint). Use the block itself as current block
// so that it's considered as a `past` chain and the validation doesn't get bypassed.
isValid, err = bc.forker.ValidateReorg(block.Header(), []*types.Header{block.Header()})
if err != nil {
return it.index, err
}
if !isValid {
return it.index, whitelist.ErrMismatch
}

if !setHead {
// Don't set the head, only insert the block
_, err = bc.writeBlockWithState(block, receipts, logs, statedb)
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