diff --git a/internal/db/type.go b/internal/db/type.go
index e79fc99..b0e8b25 100644
--- a/internal/db/type.go
+++ b/internal/db/type.go
@@ -53,7 +53,7 @@ func (d *DB) get() (db dbif.DB) {
 		panic("DB format not supported!")
 	}
 
-	if err != nil || db == nil {
+	if err != nil {
 		log.Fatalln("Database init failed:", err)
 	}
 
diff --git a/pkg/cdn/cdn.go b/pkg/cdn/cdn.go
index e39ccee..a487c9e 100644
--- a/pkg/cdn/cdn.go
+++ b/pkg/cdn/cdn.go
@@ -40,7 +40,7 @@ func (r CDNResult) String() string {
 }
 
 func NewCDN(filePath string) (*CDN, error) {
-	fileData := make([]byte, 0)
+	var fileData []byte
 	_, err := os.Stat(filePath)
 	if err != nil && os.IsNotExist(err) {
 		log.Println("文件不存在，尝试从网络获取最新CDN数据库")
diff --git a/pkg/common/httpclient.go b/pkg/common/httpclient.go
index 2d5418b..9969889 100644
--- a/pkg/common/httpclient.go
+++ b/pkg/common/httpclient.go
@@ -1,7 +1,7 @@
 package common
 
 import (
-	"io/ioutil"
+	"io"
 	"log"
 	"net/http"
 	"time"
@@ -46,8 +46,8 @@ func (c *HttpClient) Get(urls ...string) (body []byte, err error) {
 		resp, err = c.Do(req)
 
 		if err == nil && resp != nil && resp.StatusCode == 200 {
-			defer resp.Body.Close()
-			body, err = ioutil.ReadAll(resp.Body)
+			body, err = io.ReadAll(resp.Body)
+			_ = resp.Body.Close()
 			if err != nil {
 				continue
 			}
diff --git a/pkg/ip2location/ip2location.go b/pkg/ip2location/ip2location.go
index 7fb4eff..9ac0572 100644
--- a/pkg/ip2location/ip2location.go
+++ b/pkg/ip2location/ip2location.go
@@ -10,12 +10,11 @@ import (
 	"github.com/ip2location/ip2location-go/v9"
 )
 
-// IP2Location
 type IP2Location struct {
 	db *ip2location.DB
 }
 
-// new IP2Location from database file
+// NewIP2Location from database file
 func NewIP2Location(filePath string) (*IP2Location, error) {
 	_, err := os.Stat(filePath)
 	if err != nil && os.IsNotExist(err) {
diff --git a/pkg/wry/index.go b/pkg/wry/index.go
index ef0b3b0..d6cfa36 100644
--- a/pkg/wry/index.go
+++ b/pkg/wry/index.go
@@ -8,8 +8,9 @@ func (db *IPDB[uint32]) SearchIndexV4(ip uint32) uint32 {
 	ipLen := db.IPLen
 	entryLen := uint32(db.OffLen + db.IPLen)
 
-	buf := make([]byte, entryLen)
-	l, r, mid, ipc := db.IdxStart, db.IdxEnd, uint32(0), uint32(0)
+	l, r := db.IdxStart, db.IdxEnd
+	var ipc, mid uint32
+	var buf []byte
 
 	for {
 		mid = (r-l)/entryLen/2*entryLen + l
diff --git a/pkg/zxipv6wry/update.go b/pkg/zxipv6wry/update.go
index 1df1d80..67c1cd3 100644
--- a/pkg/zxipv6wry/update.go
+++ b/pkg/zxipv6wry/update.go
@@ -39,6 +39,9 @@ const (
 
 func getData() (data []byte, err error) {
 	data, err = common.GetHttpClient().Get(zx)
+	if err != nil {
+		return nil, err
+	}
 
 	file7z, err := os.CreateTemp("", "*")
 	if err != nil {