From b50be4e38dc83389925dc14f24fa11e660d32197 Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michaelni@gmx.at>
Date: Thu, 1 Dec 2011 18:35:58 +0100
Subject: [PATCH] vc1_parser: fix NULL pointer dereference Fixes Ticket456

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 0dbe48d73c..775caa69f8 100644
--- a/libavcodec/vc1.c
+++ b/libavcodec/vc1.c
@@ -896,6 +896,8 @@ int vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)
     v->rnd = get_bits1(gb);
     if (v->interlace)
         v->uvsamp = get_bits1(gb);
+    if(!ff_vc1_bfraction_vlc.table)
+        return 0; //parsing only, vlc tables havnt been allocated
     if (v->field_mode) {
         if (!v->refdist_flag)
             v->refdist = 0;