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| author | Michael Niedermayer <michael@niedermayer.cc> | 2022-09-18 20:14:07 +0300 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2022-10-09 22:33:12 +0300 |
| commit | 6447e6bb092aa5eac9ad0678ba1a81d371f1b978 (patch) | |
| tree | b0f417e72f4edf9a3bf58f6559745ac1e69009e4 | |
| parent | 23d078dbd1144688fb4982fd32a3c9076ccd83cc (diff) | |
avformat/vividas: Check packet size
Fixes: signed integer overflow: 119760682 - -2084600173 cannot be represented in type 'int'
Fixes: 50993/clusterfuzz-testcase-minimized-ffmpeg_dem_VIVIDAS_fuzzer-6745781167587328
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 5f44489cc5d4f3767f6ad2ad067ee6a3f78374bb)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavformat/vividas.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/libavformat/vividas.c b/libavformat/vividas.c index f530034736..c2141587d4 100644 --- a/libavformat/vividas.c +++ b/libavformat/vividas.c @@ -684,6 +684,7 @@ static int viv_read_packet(AVFormatContext *s, if (viv->sb_entries[viv->current_sb_entry].flag == 0) { uint64_t v_size = ffio_read_varlen(pb); + int last = 0, last_start; if (!viv->num_audio) return AVERROR_INVALIDDATA; @@ -707,12 +708,18 @@ static int viv_read_packet(AVFormatContext *s, if (i > 0 && start == 0) break; + if (start < last) + return AVERROR_INVALIDDATA; viv->n_audio_subpackets = i + 1; + last = viv->audio_subpackets[i].start = start; viv->audio_subpackets[i].pcm_bytes = pcm_bytes; } + last_start = viv->audio_subpackets[viv->n_audio_subpackets].start = (int)(off - avio_tell(pb)); + if (last_start < last) + return AVERROR_INVALIDDATA; viv->current_audio_subpacket = 0; } else { |