[FFmpeg-devel] [PATCH 4/6] avformat/iamfdec: Files without streams cannot have packets

[Michael Niedermayer]

Fixes: Assertion pkt->stream_index < (unsigned)s->nb_streams && "Invalid stream index.\n" failed at libavformat/demux.c:572
Fixes: 67890/clusterfuzz-testcase-minimized-ffmpeg_dem_IAMF_fuzzer-5166340789829632.fuzz

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
---
 libavformat/iamfdec.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libavformat/iamfdec.c b/libavformat/iamfdec.c
index e34d13e74c5..67ff7e8f01a 100644
--- a/libavformat/iamfdec.c
+++ b/libavformat/iamfdec.c
@@ -162,6 +162,9 @@ static int iamf_read_packet(AVFormatContext *s, AVPacket *pkt)
     IAMFDemuxContext *const c = s->priv_data;
     int ret;
 
+    if (!s->nb_streams)
+        return AVERROR_EOF;
+
     ret = ff_iamf_read_packet(s, c, s->pb, INT_MAX, pkt);
     if (ret < 0)
         return ret;
-- 
2.43.2