Handle NULL bytes when reading ignition from bootfifo

Author: Okoyl

internal/providers/nvidiabluefield/nvidiabluefield.go

@@ -15,6 +15,7 @@
 package nvidia_bluefield
 
 import (
+	"bytes"
 	"os"
 
 	"github.com/coreos/ignition/v2/config/v3_6_experimental/types"
@@ -37,7 +38,7 @@ func init() {
 }
 
 func fetchConfig(f *resource.Fetcher) (cfg types.Config, rpt report.Report, err error) {
-	data, err := os.ReadFile(bootfifoPath)
+	raw, err := os.ReadFile(bootfifoPath)
 	if os.IsNotExist(err) {
 		f.Logger.Info("NVIDIA BlueField bootfifo was not found. Ignoring...")
 		cfg, rpt, err = util.ParseConfig(f.Logger, []byte{})
@@ -47,12 +48,14 @@ func fetchConfig(f *resource.Fetcher) (cfg types.Config, rpt report.Report, err
 		return
 	}
 
-	if len(data) == 0 {
+	if len(raw) == 0 {
 		f.Logger.Info("no config found in NVIDIA BlueField bootfifo")
 		cfg, rpt, err = util.ParseConfig(f.Logger, []byte{})
 		return
 	}
 
+	data := bytes.Trim(raw, "\x00")
+
 	cfg, rpt, err = util.ParseConfig(f.Logger, data)
 	return
 }