fix: update param validation to fail on nil dec

CHANGELOG.md

@@ -160,6 +160,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ### Bug Fixes
 
+* [#13553](https://github.com/cosmos/cosmos-sdk/pull/13553) Ensure all parameter validation for decimal types handles nil decimal values.
 * [#13145](https://github.com/cosmos/cosmos-sdk/pull/13145) Fix panic when calling `String()` to a Record struct type.
 * [#13116](https://github.com/cosmos/cosmos-sdk/pull/13116) Fix a dead-lock in the `Group-TotalWeight` `x/group` invariant.
 * [#12548](https://github.com/cosmos/cosmos-sdk/pull/12548) Prevent signing from wrong key while using multisig.

x/mint/types/params.go

@@ -92,6 +92,9 @@ func validateInflationRateChange(i interface{}) error {
 		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)
 	}
@@ -108,6 +111,9 @@ func validateInflationMax(i interface{}) error {
 		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)
 	}
@@ -124,6 +130,9 @@ func validateInflationMin(i interface{}) error {
 		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)
 	}
@@ -140,6 +149,9 @@ func validateGoalBonded(i interface{}) error {
 		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

@@ -5,6 +5,7 @@ import (
 	"time"
 
 	"cosmossdk.io/math"
+
 	sdk "github.com/cosmos/cosmos-sdk/types"
 )
 
@@ -84,6 +85,9 @@ func validateMinSignedPerWindow(i interface{}) error {
 		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)
 	}
@@ -113,6 +117,9 @@ func validateSlashFractionDoubleSign(i interface{}) error {
 		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)
 	}
@@ -129,6 +136,9 @@ func validateSlashFractionDowntime(i interface{}) error {
 		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)
 	}

x/staking/types/params.go

@@ -194,6 +194,9 @@ func validateMinCommissionRate(i interface{}) error {
 		return fmt.Errorf("invalid parameter type: %T", i)
 	}
 
+	if v.IsNil() {
+		return fmt.Errorf("minimum commission rate cannot be nil: %s", v)
+	}
 	if v.IsNegative() {
 		return fmt.Errorf("minimum commission rate cannot be negative: %s", v)
 	}