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| author | Michael Niedermayer <michael@niedermayer.cc> | 2021-03-04 19:21:35 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2021-03-29 22:19:39 +0200 |
| commit | ea12590c8ecc1e3c4c7732e5adced21fb5feffa6 (patch) | |
| tree | 7a3bd355872a64bd4cfd4c7d76d7084c18b9a6b9 | |
| parent | 558426b847b871c142ab589e3e54361850324e11 (diff) | |
| download | ffmpeg-ea12590c8ecc1e3c4c7732e5adced21fb5feffa6.tar.gz | |
avformat/cafdec: Do not build an index if all packets are the same
Fixes: Timeout
Fixes: 28214/clusterfuzz-testcase-minimized-ffmpeg_dem_CAF_fuzzer-6495999421579264
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavformat/cafdec.c | 23 |
1 files changed, 14 insertions, 9 deletions
diff --git a/libavformat/cafdec.c b/libavformat/cafdec.c index d56187f71f..2a9299d777 100644 --- a/libavformat/cafdec.c +++ b/libavformat/cafdec.c @@ -204,15 +204,20 @@ static int read_pakt_chunk(AVFormatContext *s, int64_t size) st->nb_frames += avio_rb32(pb); /* priming frames */ st->nb_frames += avio_rb32(pb); /* remainder frames */ - st->duration = 0; - for (i = 0; i < num_packets; i++) { - if (avio_feof(pb)) - return AVERROR_INVALIDDATA; - ret = av_add_index_entry(s->streams[0], pos, st->duration, 0, 0, AVINDEX_KEYFRAME); - if (ret < 0) - return ret; - pos += caf->bytes_per_packet ? caf->bytes_per_packet : ff_mp4_read_descr_len(pb); - st->duration += caf->frames_per_packet ? caf->frames_per_packet : ff_mp4_read_descr_len(pb); + if (caf->bytes_per_packet > 0 && caf->frames_per_packet > 0) { + st->duration = caf->frames_per_packet * num_packets; + pos = caf-> bytes_per_packet * num_packets; + } else { + st->duration = 0; + for (i = 0; i < num_packets; i++) { + if (avio_feof(pb)) + return AVERROR_INVALIDDATA; + ret = av_add_index_entry(s->streams[0], pos, st->duration, 0, 0, AVINDEX_KEYFRAME); + if (ret < 0) + return ret; + pos += caf->bytes_per_packet ? caf->bytes_per_packet : ff_mp4_read_descr_len(pb); + st->duration += caf->frames_per_packet ? caf->frames_per_packet : ff_mp4_read_descr_len(pb); + } } if (avio_tell(pb) - ccount > size) { |