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alsdec: Check k used for rice decoder. 

Values that fail this check will cause failure of decode_rice()

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-04-07 17:25:47 +02:00
parent 192efcf768
commit 6c3d6a214c
1 changed files with 5 additions and 0 deletions
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5
libavcodec/alsdec.c
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@ -651,6 +651,11 @@ static int read_var_block_data(ALSDecContext *ctx, ALSBlockData *bd)
for (k = 1; k < sub_blocks; k++)
s[k] = s[k - 1] + decode_rice(gb, 0);
}
for (k = 1; k < sub_blocks; k++)
if (s[k] < 0 || s[k] > 32) {
av_log(avctx, AV_LOG_ERROR, "k invalid for rice code.\n");
return -1;
}
if (get_bits1(gb))
*bd->shift_lsbs = get_bits(gb, 4) + 1;