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avcodec/alsdec: Check r to prevent out of array read

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Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit c36fc857b5a8f8bdf2bcc54ce72bbf817902edcf)

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2016-06-07 20:50:38 +02:00
parent f50f7adf7a
commit a004e2e4f1
1 changed files with 5 additions and 0 deletions
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5
libavcodec/alsdec.c
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@ -767,6 +767,11 @@ static int read_var_block_data(ALSDecContext *ctx, ALSBlockData *bd)
r = get_unary(gb, 0, 4);
c = get_bits(gb, 2);
if (r >= 4) {
av_log(avctx, AV_LOG_ERROR, "r overflow\n");
return AVERROR_INVALIDDATA;
}
bd->ltp_gain[2] = ltp_gain_values[r][c];
bd->ltp_gain[3] = decode_rice(gb, 2) << 3;