From b51e9354772de446e8196dabf9aad1567b22f74d Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michaelni@gmx.at>
Date: Sat, 1 Feb 2014 19:04:37 +0100
Subject: [PATCH] avcodec/vc1: reset fcm/field_mode in non advanced header
 parsing

Fixes NULL pointer dereference
Fixes: signal_sigsegv_1ab8bf4_2847_cov_4254117347_SA10091.vc1
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
---
 libavcodec/vc1.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libavcodec/vc1.c b/libavcodec/vc1.c
index 832ba4c1111..49d4885dd5e 100644
--- a/libavcodec/vc1.c
+++ b/libavcodec/vc1.c
@@ -629,6 +629,8 @@ int ff_vc1_parse_frame_header(VC1Context *v, GetBitContext* gb)
 {
     int pqindex, lowquant, status;
 
+    v->field_mode = 0;
+    v->fcm = 0;
     if (v->finterpflag)
         v->interpfrm = get_bits1(gb);
     if (!v->s.avctx->codec)
-- 
2.39.5