ensure borrower matched when redeeming

Author: keithsue

x/lending/keeper/msg_server.go

@@ -191,6 +191,10 @@ func (m msgServer) Redeem(goCtx context.Context, msg *types.MsgRedeem) (*types.M
 
 	loan := m.GetLoan(ctx, msg.LoanId)
 
+	if msg.Borrower != loan.Borrower {
+		return nil, types.ErrMismatchedBorrower
+	}
+
 	if types.HashLoanSecret(msg.LoanSecret) != loan.HashLoanSecret {
 		return nil, types.ErrMismatchLoanSecret
 	}

x/lending/types/errors.go

@@ -34,8 +34,9 @@ var (
 	ErrInvalidProof       = errorsmod.Register(ModuleName, 4002, "invalid proof")
 	ErrDepositTxNotExists = errorsmod.Register(ModuleName, 4002, "deposit not exists")
 
-	ErrEmptyLoanSecret    = errorsmod.Register(ModuleName, 5001, "invalid loan secret")
-	ErrMismatchLoanSecret = errorsmod.Register(ModuleName, 5001, "mismatch loan secret")
+	ErrMismatchedBorrower = errorsmod.Register(ModuleName, 5001, "mismatched borrower")
+	ErrEmptyLoanSecret    = errorsmod.Register(ModuleName, 5002, "invalid loan secret")
+	ErrMismatchLoanSecret = errorsmod.Register(ModuleName, 5003, "mismatch loan secret")
 
 	ErrEmptyAdaptorPoint      = errorsmod.Register(ModuleName, 6001, "invalid adaptor point")
 	ErrInvalidRepayment       = errorsmod.Register(ModuleName, 6002, "invalid repayment")