fix: security report fix (#206)

client/utils.go

@@ -35,6 +35,11 @@ func Paginate(numObjs, page, limit, defLimit int) (start, end int) {
 	start = (page - 1) * limit
 	end = limit + start
 
+	if end < start {
+		// check if this produces negative numbers, resulting in end < start
+		return -1, -1
+	}
+
 	if end >= numObjs {
 		end = numObjs
 	}

x/authz/simulation/genesis.go

@@ -15,6 +15,10 @@ import (
 
 // genGrant returns a slice of authorization grants.
 func genGrant(r *rand.Rand, accounts []simtypes.Account, genT time.Time) []authz.GrantAuthorization {
+	// prevent errors if len < 1
+	if len(accounts) < 1 {
+		return make([]authz.GrantAuthorization, 0)
+	}
 	authorizations := make([]authz.GrantAuthorization, len(accounts)-1)
 	for i := 0; i < len(accounts)-1; i++ {
 		granter := accounts[i]

x/feegrant/simulation/genesis.go

@@ -12,6 +12,10 @@ import (
 
 // genFeeGrants returns a slice of randomly generated allowances.
 func genFeeGrants(r *rand.Rand, accounts []simtypes.Account) []feegrant.Grant {
+	// prevent errors if len < 1
+	if len(accounts) < 1 {
+		return make([]feegrant.Grant, 0)
+	}
 	allowances := make([]feegrant.Grant, len(accounts)-1)
 	for i := 0; i < len(accounts)-1; i++ {
 		granter := accounts[i].Address

x/nft/simulation/genesis.go

@@ -10,6 +10,9 @@ import (
 
 // genClasses returns a slice of nft class.
 func genClasses(r *rand.Rand, accounts []simtypes.Account) []*nft.Class {
+	if len(accounts) < 1 {
+		return make([]*nft.Class, 0)
+	}
 	classes := make([]*nft.Class, len(accounts)-1)
 	for i := 0; i < len(accounts)-1; i++ {
 		classes[i] = &nft.Class{