From 1af9fdc3baa47596757da7c401d58710cef45c75 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Sat, 10 Mar 2012 00:08:32 +0100 Subject: [PATCH] snow: reject unsupported chroma shifts. Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind Signed-off-by: Michael Niedermayer --- libavcodec/snowdec.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/libavcodec/snowdec.c b/libavcodec/snowdec.c index 265d8e7dd0..537a6c6e8f 100644 --- a/libavcodec/snowdec.c +++ b/libavcodec/snowdec.c @@ -336,6 +336,11 @@ static int decode_header(SnowContext *s){ return -1; } + if (s->chroma_h_shift != 1 || s->chroma_v_shift != 1) { + av_log(s->avctx, AV_LOG_ERROR, "Invalid chroma shift\n"); + return AVERROR_PATCHWELCOME; + } + s->qlog += get_symbol(&s->c, s->header_state, 1); s->mv_scale += get_symbol(&s->c, s->header_state, 1); s->qbias += get_symbol(&s->c, s->header_state, 1);