From 1c23e1ff7e8e7d6febb36f867fdaec4ab8f74cca Mon Sep 17 00:00:00 2001
From: aler9 <46489434+aler9@users.noreply.github.com>
Date: Tue, 28 Sep 2021 22:25:22 +0200
Subject: [PATCH] avoid crash in case of invalid H264 SPS
 (https://github.com/aler9/rtsp-simple-server/issues/590)

---
 track.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/track.go b/track.go
index 291a5424..2e17fa1c 100644
--- a/track.go
+++ b/track.go
@@ -142,6 +142,10 @@ func (t *Track) ClockRate() (int, error) {
 
 // NewTrackH264 initializes an H264 track.
 func NewTrackH264(payloadType uint8, conf *TrackConfigH264) (*Track, error) {
+	if len(conf.SPS) < 4 {
+		return nil, fmt.Errorf("invalid SPS")
+	}
+
 	spropParameterSets := base64.StdEncoding.EncodeToString(conf.SPS) +
 		"," + base64.StdEncoding.EncodeToString(conf.PPS)
 	profileLevelID := strings.ToUpper(hex.EncodeToString(conf.SPS[1:4]))