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avcodec/adpcm: Set vqa_version before use in init

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Fixes: null pointer dereference
Fixes: 33172/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ADPCM_IMA_WS_fuzzer-5200164273913856

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 2021-04-19 16:20:55 +02:00
parent 38c4761588
commit 7a403da0cb
1 changed files with 2 additions and 0 deletions
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2
libavcodec/adpcm.c
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@ -193,6 +193,8 @@ static av_cold int adpcm_decode_init(AVCodecContext * avctx)
avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
break;
case AV_CODEC_ID_ADPCM_IMA_WS:
if (avctx->extradata && avctx->extradata_size >= 2)
c->vqa_version = AV_RL16(avctx->extradata);
avctx->sample_fmt = c->vqa_version == 3 ? AV_SAMPLE_FMT_S16P :
AV_SAMPLE_FMT_S16;
break;