fixes

(cherry picked from commit a2c386915ce11b9422f4af8ae181eaa1a22bc5c3)

pkg/tsdb/testdatasource/csv_data.go

@@ -8,7 +8,6 @@ import (
 	"io"
 	"os"
 	"path/filepath"
-	"regexp"
 	"strconv"
 	"strings"
 	"time"
@@ -73,13 +72,12 @@ func (s *Service) handleCsvFileScenario(ctx context.Context, req *backend.QueryD
 }
 
 func (s *Service) loadCsvFile(fileName string) (*data.Frame, error) {
-	validFileName := regexp.MustCompile(`([\w_]+)\.csv`)
-
-	if !validFileName.MatchString(fileName) {
+	if filepath.Ext(fileName) != ".csv" || strings.Contains(fileName, "..") {
 		return nil, fmt.Errorf("invalid csv file name: %q", fileName)
 	}
 
-	filePath := filepath.Join(s.cfg.StaticRootPath, "testdata", fileName)
+	csvFilepath := filepath.Clean(filepath.Join("/", fileName))
+	filePath := filepath.Join(s.cfg.StaticRootPath, "testdata", csvFilepath)
 
 	// Can ignore gosec G304 here, because we check the file pattern above
 	// nolint:gosec