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core/blockchain: minor clarity change

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Martin Holst Swende 2019-02-21 10:16:19 +01:00
parent 2d64d3389f
commit e6eb32f904
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1 changed files with 3 additions and 2 deletions
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5
core/blockchain.go
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@ -1319,11 +1319,12 @@ func (bc *BlockChain) insertSidechain(block *types.Block, it *insertIterator) (i
for ; block != nil && (err == consensus.ErrPrunedAncestor); block, err = it.next() {
// Check the canonical state root for that number
if number := block.NumberU64(); current.NumberU64() >= number {
if canonical := bc.GetBlockByNumber(number); canonical != nil && canonical.Hash() == block.Hash() {
canonical := bc.GetBlockByNumber(number)
if canonical != nil && canonical.Hash() == block.Hash() {
// Not a sidechain block, this is a re-import of a canon block which has it's state pruned
continue
}
if canonical := bc.GetBlockByNumber(number); canonical != nil && canonical.Root() == block.Root() {
if canonical != nil && canonical.Root() == block.Root() {
// This is most likely a shadow-state attack. When a fork is imported into the
// database, and it eventually reaches a block height which is not pruned, we
// just found that the state already exist! This means that the sidechain block