From e985cfd18bc416d3ff0c83ccafdc1ac733e6d522 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Mon, 16 Apr 2012 13:35:41 +0200 Subject: [PATCH] vc1dec: check end_mb_y / start_mb_y validity Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind Signed-off-by: Michael Niedermayer --- libavcodec/vc1dec.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/libavcodec/vc1dec.c b/libavcodec/vc1dec.c index b8b0e73dab..f5580bfafb 100644 --- a/libavcodec/vc1dec.c +++ b/libavcodec/vc1dec.c @@ -5606,6 +5606,10 @@ static int vc1_decode_frame(AVCodecContext *avctx, void *data, s->end_mb_y = (i == n_slices ) ? mb_height : FFMIN(mb_height, slices[i].mby_start % mb_height); else s->end_mb_y = (i <= n_slices1 + 1) ? mb_height : FFMIN(mb_height, slices[i].mby_start % mb_height); + if (s->end_mb_y <= s->start_mb_y) { + av_log(v->s.avctx, AV_LOG_ERROR, "end mb y %d %d invalid\n", s->end_mb_y, s->start_mb_y); + continue; + } vc1_decode_blocks(v); if (i != n_slices) s->gb = slices[i].gb;