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4xm: check if there are bits left in decode_i_block()
Fixed Ticket753 Bug Found by: Diana Elena Muscalu Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
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@ -459,6 +459,11 @@ static int decode_p_frame(FourXContext *f, const uint8_t *buf, int length){
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static int decode_i_block(FourXContext *f, DCTELEM *block){
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int code, i, j, level, val;
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if(get_bits_left(&f->gb) < 2){
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av_log(f->avctx, AV_LOG_ERROR, "%d bits left before decode_i_block()\n", get_bits_left(&f->gb));
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return -1;
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}
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/* DC coef */
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val = get_vlc2(&f->pre_gb, f->pre_vlc.table, ACDC_VLC_BITS, 3);
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if (val>>4){
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