Check that client state is zeroed out for ibc client upgrade proposals

CHANGELOG.md

@@ -78,6 +78,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 * (modules/core/04-channel) [\#1130](https://github.com/cosmos/ibc-go/pull/1130) Call `packet.GetSequence()` rather than passing func in `WriteAcknowledgement` log output
 * (apps/29-fee) [\#1278](https://github.com/cosmos/ibc-go/pull/1278) The URI path for the query to get all incentivized packets for a specifc channel did not follow the same format as the rest of queries.
+* (modules/core/02-client)[\#1676](https://github.com/cosmos/ibc-go/pull/1676) ClientState must be zeroed out for `UpgradeProposals` to pass validation. This prevents a proposal containing information governance is not actually voting on.
 
 ## [v3.0.0](https://github.com/cosmos/ibc-go/releases/tag/v3.0.0) - 2022-03-15
 

modules/core/02-client/types/proposal.go

@@ -2,6 +2,7 @@ package types
 
 import (
 	"fmt"
+	"reflect"
 
 	codectypes "github.com/cosmos/cosmos-sdk/codec/types"
 	sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
@@ -111,11 +112,15 @@ func (up *UpgradeProposal) ValidateBasic() error {
 		return sdkerrors.Wrap(ErrInvalidUpgradeProposal, "upgraded client state cannot be nil")
 	}
 
-	_, err := UnpackClientState(up.UpgradedClientState)
+	clientState, err := UnpackClientState(up.UpgradedClientState)
 	if err != nil {
 		return sdkerrors.Wrap(err, "failed to unpack upgraded client state")
 	}
 
+	if !reflect.DeepEqual(clientState, clientState.ZeroCustomFields()) {
+		return sdkerrors.Wrap(ErrInvalidUpgradeProposal, "upgraded client state is not zeroed out")
+	}
+
 	return nil
 }
 

modules/core/02-client/types/proposal_test.go

@@ -109,21 +109,32 @@ func (suite *TypesTestSuite) TestUpgradeProposalValidateBasic() {
 	}{
 		{
 			"success", func() {
-				proposal, err = types.NewUpgradeProposal(ibctesting.Title, ibctesting.Description, plan, cs)
+				proposal, err = types.NewUpgradeProposal(ibctesting.Title, ibctesting.Description, plan, cs.ZeroCustomFields())
 				suite.Require().NoError(err)
 			}, true,
 		},
 		{
 			"fails validate abstract - empty title", func() {
-				proposal, err = types.NewUpgradeProposal("", ibctesting.Description, plan, cs)
+				proposal, err = types.NewUpgradeProposal("", ibctesting.Description, plan, cs.ZeroCustomFields())
+				suite.Require().NoError(err)
+
+			}, false,
+		},
+		{
+			"non zeroed fields", func() {
+				proposal, err = types.NewUpgradeProposal(ibctesting.Title, ibctesting.Description, plan, &ibctmtypes.ClientState{
+					FrozenHeight: types.Height{
+						RevisionHeight: 10,
+					},
+				})
 				suite.Require().NoError(err)
 
 			}, false,
 		},
 		{
 			"plan height is zero", func() {
 				invalidPlan := upgradetypes.Plan{Name: "ibc upgrade", Height: 0}
-				proposal, err = types.NewUpgradeProposal(ibctesting.Title, ibctesting.Description, invalidPlan, cs)
+				proposal, err = types.NewUpgradeProposal(ibctesting.Title, ibctesting.Description, invalidPlan, cs.ZeroCustomFields())
 				suite.Require().NoError(err)
 			}, false,
 		},