Quoting Michael Niedermayer (2023-10-05 21:44:37)
> Fixes: Assertion pkt->stream_index < (unsigned)s->nb_streams && "Invalid 
> stream index.\n" failed at libavformat/demux.c:617
> Fixes: 
> 62498/clusterfuzz-testcase-minimized-ffmpeg_dem_USM_fuzzer-4734740995112960
> 
> Found-by: continuous fuzzing process 
> https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
> Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc>
> ---
>  libavformat/usmdec.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/libavformat/usmdec.c b/libavformat/usmdec.c
> index 1665eb8e551..b0079a1230c 100644
> --- a/libavformat/usmdec.c
> +++ b/libavformat/usmdec.c
> @@ -361,7 +361,7 @@ static int64_t parse_chunk(AVFormatContext *s, 
> AVIOContext *pb,
>      ret = avio_skip(pb, FFMAX(0, chunk_size - (ret - chunk_start)));
>      if (ret < 0)
>          return ret;
> -    return 0;
> +    return AVERROR(EAGAIN);

I believe that should be FFERROR_REDO instead.

-- 
Anton Khirnov
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