Commit c20a6963 authored by Michael Niedermayer's avatar Michael Niedermayer Committed by Anton Khirnov

cavsdec: check for changing w/h.

Our decoder does not support changing w/h.

Fixes CVE-2012-2777 and CVE-2012-2784.

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: 's avatarAnton Khirnov <>
parent 12e1e834
......@@ -1056,12 +1056,21 @@ static int decode_pic(AVSContext *h) {
static int decode_seq_header(AVSContext *h) {
MpegEncContext *s = &h->s;
int frame_rate_code;
int width, height;
h->profile = get_bits(&s->gb,8);
h->level = get_bits(&s->gb,8);
skip_bits1(&s->gb); //progressive sequence
s->width = get_bits(&s->gb,14);
s->height = get_bits(&s->gb,14);
width = get_bits(&s->gb, 14);
height = get_bits(&s->gb, 14);
if ((s->width || s->height) && (s->width != width || s->height != height)) {
av_log_missing_feature(s, "Width/height changing in CAVS is", 0);
s->width = width;
s->height = height;
skip_bits(&s->gb,2); //chroma format
skip_bits(&s->gb,3); //sample_precision
h->aspect_ratio = get_bits(&s->gb,4);
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