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statesync: fix valset off-by-one causing consensus failures (#5311)

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This commit is contained in:
Erik Grinaker
2020-08-31 13:31:00 +02:00
committed by GitHub
parent 86707862d4
commit 686361ff3e
2 changed files with 8 additions and 7 deletions
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statesync/stateprovider.go
+5 -6
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@@ -120,9 +120,8 @@ func (s *lightClientStateProvider) State(height uint64) (sm.State, error) {
state.InitialHeight = 1
}
// We need to verify up until h+2, to get the validator set. This also prefetches the headers
// for h and h+1 in the typical case where the trusted header is after the snapshot height.
_, err := s.lc.VerifyHeaderAtHeight(int64(height+2), time.Now())
// We need to verify the previous block to get the validator set.
_, err := s.lc.VerifyHeaderAtHeight(int64(height-1), time.Now())
if err != nil {
return sm.State{}, err
}
@@ -140,15 +139,15 @@ func (s *lightClientStateProvider) State(height uint64) (sm.State, error) {
state.AppHash = nextHeader.AppHash
state.LastResultsHash = nextHeader.LastResultsHash
state.LastValidators, _, err = s.lc.TrustedValidatorSet(int64(height))
state.LastValidators, _, err = s.lc.TrustedValidatorSet(int64(height - 1))
if err != nil {
return sm.State{}, err
}
state.Validators, _, err = s.lc.TrustedValidatorSet(int64(height + 1))
state.Validators, _, err = s.lc.TrustedValidatorSet(int64(height))
if err != nil {
return sm.State{}, err
}
state.NextValidators, _, err = s.lc.TrustedValidatorSet(int64(height + 2))
state.NextValidators, _, err = s.lc.TrustedValidatorSet(int64(height + 1))
if err != nil {
return sm.State{}, err
}