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Fix #19198 - Be defensive in handling getBlock result, it can be nil

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This commit is contained in:
Sjon Hortensius 2019-08-12 14:33:14 +02:00
parent 8657a0d6b5
commit 8c37494b7f
1 changed files with 6 additions and 0 deletions
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6
core/blockchain.go
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@ -875,12 +875,18 @@ func (bc *BlockChain) Rollback(chain []common.Hash) {
}
if currentFastBlock := bc.CurrentFastBlock(); currentFastBlock.Hash() == hash {
newFastBlock := bc.GetBlock(currentFastBlock.ParentHash(), currentFastBlock.NumberU64()-1)
if newFastBlock == nil {
log.Crit("Failed to retrieve previous fastBlock during rollback")
}
rawdb.WriteHeadFastBlockHash(bc.db, newFastBlock.Hash())
bc.currentFastBlock.Store(newFastBlock)
headFastBlockGauge.Update(int64(newFastBlock.NumberU64()))
}
if currentBlock := bc.CurrentBlock(); currentBlock.Hash() == hash {
newBlock := bc.GetBlock(currentBlock.ParentHash(), currentBlock.NumberU64()-1)
if newBlock == nil {
log.Crit("Failed to retrieve previous block during rollback")
}
rawdb.WriteHeadBlockHash(bc.db, newBlock.Hash())
bc.currentBlock.Store(newBlock)
headBlockGauge.Update(int64(newBlock.NumberU64()))