fix: update param validation to fail on nil dec (backport #1323) (#1325)

* fix: update param validation to fail on nil dec (#1323)

* fix: update param validation to fail on nil dec

* chore: update changelog

(cherry picked from commit 55b6566)

# Conflicts:
#	CHANGELOG.md

* Update CHANGELOG.md

---------

Co-authored-by: jaeseung-bae <119839167+jaeseung-bae@users.noreply.github.com>
Co-authored-by: Youngtaek Yoon <noreply@yoon.mailer.me>

CHANGELOG.md

@@ -58,6 +58,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 * (types) [\#1313](https://github.com/Finschia/finschia-sdk/pull/1313) fix correctly coalesce coins even with repeated denominations(backport cosmos/cosmos-sdk#13265)
 * (x/crypto) [\#1316](https://github.com/Finschia/finschia-sdk/pull/1316) error if incorrect ledger public key (backport cosmos/cosmos-sdk#14460, cosmos/cosmos-sdk#19691) 
 * (x/auth) [#1319](https://github.com/Finschia/finschia-sdk/pull/1319) prevent signing from wrong key in multisig
+* (x/mint, x/slashing) [\#1323](https://github.com/Finschia/finschia-sdk/pull/1323) add missing nil check for params validation
 
 ### Removed
 

x/mint/types/params.go

@@ -5,7 +5,7 @@ import (
 	"fmt"
 	"strings"
 
-	yaml "gopkg.in/yaml.v2"
+	"gopkg.in/yaml.v2"
 
 	sdk "github.com/Finschia/finschia-sdk/types"
 	paramtypes "github.com/Finschia/finschia-sdk/x/params/types"
@@ -120,7 +120,9 @@ func validateInflationRateChange(i interface{}) error {
 	if !ok {
 		return fmt.Errorf("invalid parameter type: %T", i)
 	}
-
+	if v.IsNil() {
+		return fmt.Errorf("inflation rate change cannot be nil: %s", v)
+	}
 	if v.IsNegative() {
 		return fmt.Errorf("inflation rate change cannot be negative: %s", v)
 	}
@@ -136,7 +138,9 @@ func validateInflationMax(i interface{}) error {
 	if !ok {
 		return fmt.Errorf("invalid parameter type: %T", i)
 	}
-
+	if v.IsNil() {
+		return fmt.Errorf("max inflation cannot be nil: %s", v)
+	}
 	if v.IsNegative() {
 		return fmt.Errorf("max inflation cannot be negative: %s", v)
 	}
@@ -152,7 +156,9 @@ func validateInflationMin(i interface{}) error {
 	if !ok {
 		return fmt.Errorf("invalid parameter type: %T", i)
 	}
-
+	if v.IsNil() {
+		return fmt.Errorf("min inflation cannot be nil: %s", v)
+	}
 	if v.IsNegative() {
 		return fmt.Errorf("min inflation cannot be negative: %s", v)
 	}
@@ -168,7 +174,9 @@ func validateGoalBonded(i interface{}) error {
 	if !ok {
 		return fmt.Errorf("invalid parameter type: %T", i)
 	}
-
+	if v.IsNil() {
+		return fmt.Errorf("goal bonded cannot be nil: %s", v)
+	}
 	if v.IsNegative() || v.IsZero() {
 		return fmt.Errorf("goal bonded must be positive: %s", v)
 	}

x/slashing/types/params.go

@@ -85,7 +85,9 @@ func validateMinSignedPerWindow(i interface{}) error {
 	if !ok {
 		return fmt.Errorf("invalid parameter type: %T", i)
 	}
-
+	if v.IsNil() {
+		return fmt.Errorf("min signed per window cannot be nil: %s", v)
+	}
 	if v.IsNegative() {
 		return fmt.Errorf("min signed per window cannot be negative: %s", v)
 	}
@@ -114,7 +116,9 @@ func validateSlashFractionDoubleSign(i interface{}) error {
 	if !ok {
 		return fmt.Errorf("invalid parameter type: %T", i)
 	}
-
+	if v.IsNil() {
+		return fmt.Errorf("double sign slash fraction cannot be nil: %s", v)
+	}
 	if v.IsNegative() {
 		return fmt.Errorf("double sign slash fraction cannot be negative: %s", v)
 	}
@@ -130,7 +134,9 @@ func validateSlashFractionDowntime(i interface{}) error {
 	if !ok {
 		return fmt.Errorf("invalid parameter type: %T", i)
 	}
-
+	if v.IsNil() {
+		return fmt.Errorf("downtime slash fraction cannot be nil: %s", v)
+	}
 	if v.IsNegative() {
 		return fmt.Errorf("downtime slash fraction cannot be negative: %s", v)
 	}