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avcodec/adpcm: Clip step index for ADPCM_IMA_APM

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Fixes: out of array access
Fixes: 20828/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ADPCM_IMA_APM_fuzzer-5712770106654720

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 2020-03-01 22:30:00 +01:00
parent 5603176ab4
commit ac73879f1b
1 changed files with 2 additions and 2 deletions
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4
libavcodec/adpcm.c
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@ -154,9 +154,9 @@ static av_cold int adpcm_decode_init(AVCodecContext * avctx)
case AV_CODEC_ID_ADPCM_IMA_APM:
if (avctx->extradata && avctx->extradata_size >= 16) {
c->status[0].predictor = AV_RL32(avctx->extradata + 0);
c->status[0].step_index = AV_RL32(avctx->extradata + 4);
c->status[0].step_index = av_clip(AV_RL32(avctx->extradata + 4), 0, 88);
c->status[1].predictor = AV_RL32(avctx->extradata + 8);
c->status[1].step_index = AV_RL32(avctx->extradata + 12);
c->status[1].step_index = av_clip(AV_RL32(avctx->extradata + 12), 0, 88);
}
break;
case AV_CODEC_ID_ADPCM_IMA_WS: