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avformat/boadec: Check that channels and block_align are set

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Fixes: Infinite loop
Fixes: 26381/clusterfuzz-testcase-minimized-ffmpeg_dem_BOA_fuzzer-5745789089087488

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 2020-10-16 19:09:37 +02:00
parent 2be51d14f2
commit 44ff5a1bff
1 changed files with 2 additions and 2 deletions
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4
libavformat/boadec.c
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@ -54,12 +54,12 @@ static int read_header(AVFormatContext *s)
avio_rl32(s->pb); avio_rl32(s->pb);
st->codecpar->sample_rate = avio_rl32(s->pb); st->codecpar->sample_rate = avio_rl32(s->pb);
st->codecpar->channels = avio_rl32(s->pb); st->codecpar->channels = avio_rl32(s->pb);
if (st->codecpar->channels > FF_SANE_NB_CHANNELS) if (st->codecpar->channels > FF_SANE_NB_CHANNELS || st->codecpar->channels <= 0)
return AVERROR(ENOSYS); return AVERROR(ENOSYS);
s->internal->data_offset = avio_rl32(s->pb); s->internal->data_offset = avio_rl32(s->pb);
avio_r8(s->pb); avio_r8(s->pb);
st->codecpar->block_align = avio_rl32(s->pb); st->codecpar->block_align = avio_rl32(s->pb);
if (st->codecpar->block_align > INT_MAX / FF_SANE_NB_CHANNELS) if (st->codecpar->block_align > INT_MAX / FF_SANE_NB_CHANNELS || st->codecpar->block_align <= 0)
return AVERROR_INVALIDDATA; return AVERROR_INVALIDDATA;
st->codecpar->block_align *= st->codecpar->channels; st->codecpar->block_align *= st->codecpar->channels;