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avcodec/mp3_header_decompress_bsf: Check sample_rate_index

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Fixes: out of array read
Fixes: 19309/clusterfuzz-testcase-minimized-ffmpeg_BSF_MP3_HEADER_DECOMPRESS_fuzzer-5651002950942720

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-12-14 00:37:27 +01:00
parent 1f8e43938b
commit f064c7c449
1 changed files with 5 additions and 0 deletions
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5
libavcodec/mp3_header_decompress_bsf.c
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@ -62,6 +62,11 @@ static int mp3_header_decompress(AVBSFContext *ctx, AVPacket *out)
lsf = sample_rate < (24000+32000)/2;
mpeg25 = sample_rate < (12000+16000)/2;
sample_rate_index= (header>>10)&3;
if (sample_rate_index == 3) {
ret = AVERROR_INVALIDDATA;
goto fail;
}
sample_rate= avpriv_mpa_freq_tab[sample_rate_index] >> (lsf + mpeg25); //in case sample rate is a little off
for(bitrate_index=2; bitrate_index<30; bitrate_index++){