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avcodec/alsdec: Check r to prevent out of array read
No testcase known Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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@ -767,6 +767,11 @@ static int read_var_block_data(ALSDecContext *ctx, ALSBlockData *bd)
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r = get_unary(gb, 0, 4);
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c = get_bits(gb, 2);
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if (r >= 4) {
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av_log(avctx, AV_LOG_ERROR, "r overflow\n");
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return AVERROR_INVALIDDATA;
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}
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bd->ltp_gain[2] = ltp_gain_values[r][c];
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bd->ltp_gain[3] = decode_rice(gb, 2) << 3;
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