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avformat/vpk: Fix integer overflow in samples_per_block computation

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Fixes: signed integer overflow: 84026453 * 28 cannot be represented in type 'int'
Fixes: 15111/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-5675630072430592

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-06-06 23:14:13 +02:00
parent 6f2625aafc
commit 8c6c4129b4
1 changed files with 2 additions and 2 deletions
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4
libavformat/vpk.c
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@ -56,12 +56,12 @@ static int vpk_read_header(AVFormatContext *s)
st->codecpar->codec_id = AV_CODEC_ID_ADPCM_PSX;
st->codecpar->block_align = avio_rl32(s->pb);
st->codecpar->sample_rate = avio_rl32(s->pb);
if (st->codecpar->sample_rate <= 0)
if (st->codecpar->sample_rate <= 0 || st->codecpar->block_align <= 0)
return AVERROR_INVALIDDATA;
st->codecpar->channels = avio_rl32(s->pb);
if (st->codecpar->channels <= 0)
return AVERROR_INVALIDDATA;
samples_per_block = ((st->codecpar->block_align / st->codecpar->channels) * 28) / 16;
samples_per_block = ((st->codecpar->block_align / st->codecpar->channels) * 28LL) / 16;
if (samples_per_block <= 0)
return AVERROR_INVALIDDATA;
vpk->block_count = (st->duration + (samples_per_block - 1)) / samples_per_block;