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evidence: prevent proposer from proposing duplicate pieces of evidence (#4839)

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prevent proposer from proposing duplicate pieces of evidence
This commit is contained in:
Callum Waters
2020-05-13 18:46:30 +02:00
committed by GitHub
parent 243dfbd585
commit c0682a3bed
7 changed files with 47 additions and 36 deletions
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8
state/validation.go
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@@ -127,7 +127,13 @@ func validateBlock(evidencePool EvidencePool, stateDB dbm.DB, state State, block
}
// Validate all evidence.
for _, ev := range block.Evidence.Evidence {
for idx, ev := range block.Evidence.Evidence {
// check that no evidence has been submitted more than once
for i := idx + 1; i < len(block.Evidence.Evidence); i++ {
if ev.Equal(block.Evidence.Evidence[i]) {
return types.NewErrEvidenceInvalid(ev, errors.New("evidence was submitted twice"))
}
}
if evidencePool != nil {
if evidencePool.IsCommitted(ev) {
return types.NewErrEvidenceInvalid(ev, errors.New("evidence was already committed"))