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mpc7: check subband index
This fixes a overread Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
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@ -248,6 +248,10 @@ static int mpc7_decode_frame(AVCodecContext * avctx, void *data,
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if(i) t = get_vlc2(&gb, hdr_vlc.table, MPC7_HDR_BITS, 1) - 5;
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if(i) t = get_vlc2(&gb, hdr_vlc.table, MPC7_HDR_BITS, 1) - 5;
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if(t == 4) bands[i].res[ch] = get_bits(&gb, 4);
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if(t == 4) bands[i].res[ch] = get_bits(&gb, 4);
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else bands[i].res[ch] = bands[i-1].res[ch] + t;
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else bands[i].res[ch] = bands[i-1].res[ch] + t;
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if (bands[i].res[ch] < -1 || bands[i].res[ch] > 17) {
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av_log(avctx, AV_LOG_ERROR, "subband index invalid\n");
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return AVERROR_INVALIDDATA;
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}
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}
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}
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if(bands[i].res[0] || bands[i].res[1]){
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if(bands[i].res[0] || bands[i].res[1]){
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