check denom for initialize

x/confidentialtransfers/keeper/msg_server.go

@@ -40,6 +40,12 @@ func (m msgServer) InitializeAccount(goCtx context.Context, req *types.MsgInitia
 		return nil, sdkerrors.Wrap(sdkerrors.ErrNotFound, "account already exists")
 	}
 
+	// Check if denom already exists.
+	_, denomExists := m.Keeper.BankKeeper().GetDenomMetaData(ctx, instruction.Denom)
+	if !denomExists {
+		return nil, sdkerrors.Wrap(sdkerrors.ErrInvalidRequest, "denom does not exist")
+	}
+
 	// Validate the public key
 	validated := zkproofs.VerifyPubKeyValidity(*instruction.Pubkey, *instruction.Proofs.PubkeyValidityProof)
 	if !validated {

x/confidentialtransfers/types/expected_keepers.go

@@ -3,6 +3,7 @@ package types
 import (
 	sdk "github.com/cosmos/cosmos-sdk/types"
 	"github.com/cosmos/cosmos-sdk/x/auth/types"
+	banktypes "github.com/cosmos/cosmos-sdk/x/bank/types"
 )
 
 // AccountKeeper defines the contract required for account APIs.
@@ -17,6 +18,7 @@ type AccountKeeper interface {
 // BankKeeper defines the contract needed to be fulfilled for banking and supply
 // dependencies.
 type BankKeeper interface {
+	GetDenomMetaData(ctx sdk.Context, denom string) (banktypes.Metadata, bool)
 	SendCoinsFromModuleToAccount(ctx sdk.Context, senderModule string, recipientAddr sdk.AccAddress, amt sdk.Coins) error
 	SendCoinsFromAccountToModule(ctx sdk.Context, senderAddr sdk.AccAddress, recipientModule string, amt sdk.Coins) error
 }