avcodec/adpcm: Clip step index for ADPCM_IMA_APM

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

Michael Niedermayer committed 6 years ago

Commit ac738791 parent 56031761 file · +2 −2Browse files

Unified · Split

@@ -154,9 +154,9 @@ static av_cold int adpcm_decode_init(AVCodecContext * avctx) · 153 unmodified lines
154	154	case AV_CODEC_ID_ADPCM_IMA_APM:
155	155	if (avctx->extradata && avctx->extradata_size >= 16) {
156	156	c->status[0].predictor = AV_RL32(avctx->extradata + 0);
157		− c->status[0].step_index = AV_RL32(avctx->extradata + 4);
	157	+ c->status[0].step_index = av_clip(AV_RL32(avctx->extradata + 4), 0, 88);
158	158	c->status[1].predictor = AV_RL32(avctx->extradata + 8);
159		− c->status[1].step_index = AV_RL32(avctx->extradata + 12);
	159	+ c->status[1].step_index = av_clip(AV_RL32(avctx->extradata + 12), 0, 88);
160	160	}
161	161	break;
162	162	case AV_CODEC_ID_ADPCM_IMA_WS:

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