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fix: noop on UpdateState for invalid misbehaviour (backport #6276) #6297

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May 13, 2024
Merged

fix: noop on UpdateState for invalid misbehaviour (backport #6276) #6297

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b4ae768
fix: noop on UpdateState for invalid misbehaviour (#6276)
damiannolan May 13, 2024
7e3b62f
chore: rm unused import
damiannolan May 13, 2024
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2 changes: 2 additions & 0 deletions CHANGELOG.md
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Expand Up @@ -42,6 +42,8 @@ Ref: https://keepachangelog.com/en/1.0.0/

### State Machine Breaking

* (light-clients/07-tendermint) Fix: No-op to avoid panicking on `UpdateState` for invalid misbehaviour submissions.

### Improvements

* (apps/27-interchain-accounts, apps/tranfer, apps/29-fee) [\#6253](https://github.com/cosmos/ibc-go/pull/6253) Allow channel handshake to succeed if fee middleware is wired up on one side, but not the other.
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5 changes: 3 additions & 2 deletions modules/light-clients/07-tendermint/update.go
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Expand Up @@ -2,7 +2,6 @@ package tendermint

import (
"bytes"
"fmt"

errorsmod "cosmossdk.io/errors"
storetypes "cosmossdk.io/store/types"
Expand Down Expand Up @@ -131,10 +130,12 @@ func (cs *ClientState) verifyHeader(
// UpdateState must only be used to update within a single revision, thus header revision number and trusted height's revision
// number must be the same. To update to a new revision, use a separate upgrade path
// UpdateState will prune the oldest consensus state if it is expired.
// If the provided clientMsg is not of type of Header then the handler will noop and empty slice is returned.
func (cs ClientState) UpdateState(ctx sdk.Context, cdc codec.BinaryCodec, clientStore storetypes.KVStore, clientMsg exported.ClientMessage) []exported.Height {
header, ok := clientMsg.(*Header)
if !ok {
panic(fmt.Errorf("expected type %T, got %T", &Header{}, clientMsg))
// clientMsg is invalid Misbehaviour, no update necessary
return []exported.Height{}
}

cs.pruneOldestConsensusState(ctx, cdc, clientStore)
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9 changes: 6 additions & 3 deletions modules/light-clients/07-tendermint/update_test.go
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Expand Up @@ -509,9 +509,12 @@ func (suite *TendermintTestSuite) TestUpdateState() {
suite.Require().Equal(expConsensusState, updatedConsensusState)

} else {
suite.Require().Panics(func() {
clientState.UpdateState(suite.chainA.GetContext(), suite.chainA.App.AppCodec(), clientStore, clientMessage)
})
consensusHeights = clientState.UpdateState(suite.chainA.GetContext(), suite.chainA.App.AppCodec(), clientStore, clientMessage)
suite.Require().Empty(consensusHeights)

consensusState, found := suite.chainA.GetSimApp().GetIBCKeeper().ClientKeeper.GetClientConsensusState(suite.chainA.GetContext(), path.EndpointA.ClientID, clienttypes.NewHeight(1, uint64(suite.chainB.GetContext().BlockHeight())))
suite.Require().False(found)
suite.Require().Nil(consensusState)
}

// perform custom checks
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