bugfix in go-fuzz engine

Author: Yevgeny Pats

client/client.go

@@ -11,7 +11,7 @@ import (
 )
 
 const FuzzitEndpoint = "https://app.fuzzit.dev"
-const Version = "v2.4.67"
+const Version = "v2.4.68"
 
 type Target struct {
 	Name         string `firestore:"target_name"`

client/commands.go

@@ -310,7 +310,7 @@ func (c *FuzzitClient) CreateJob(jobConfig Job, files []string) (*firestore.Docu
 
 	fuzzerPath := files[0]
 	filename := filepath.Base(fuzzerPath)
-	if !strings.HasSuffix(filename, ".tar.gz") {
+	if !strings.HasSuffix(filename, ".tar.gz") && jobConfig.Engine != "go-fuzz" {
 		tmpDir, err := ioutil.TempDir("", "fuzzit")
 		if err != nil {
 			return nil, err

client/utils.go

@@ -50,8 +50,12 @@ func catLastBytes(path string, lastBytes int64) error {
 
 	buf := make([]byte, lastBytes)
 	stat, err := os.Stat(path)
-	start := stat.Size() - lastBytes
-	_, err = fh.ReadAt(buf, start)
+	start := 0
+	if stat.Size() > lastBytes {
+		start = int(stat.Size() - lastBytes)
+	}
+
+	_, err = fh.ReadAt(buf, int64(start))
 	if err != nil {
 		return err
 	}