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4xm: check if there are bits left in decode_i_block()

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Fixed Ticket753
Bug Found by: Diana Elena Muscalu

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2011-12-14 22:20:39 +01:00
parent 76b9a0961c
commit e1ba29c764
1 changed files with 5 additions and 0 deletions
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5
libavcodec/4xm.c
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@ -459,6 +459,11 @@ static int decode_p_frame(FourXContext *f, const uint8_t *buf, int length){
static int decode_i_block(FourXContext *f, DCTELEM *block){
int code, i, j, level, val;
if(get_bits_left(&f->gb) < 2){
av_log(f->avctx, AV_LOG_ERROR, "%d bits left before decode_i_block()\n", get_bits_left(&f->gb));
return -1;
}
/* DC coef */
val = get_vlc2(&f->pre_gb, f->pre_vlc.table, ACDC_VLC_BITS, 3);
if (val>>4){