[FFmpeg-cvslog] avcodec/vc1: reset fcm/field_mode in non advanced header parsing

[Michael Niedermayer]

ffmpeg | branch: release/0.11 | Michael Niedermayer <michaelni at gmx.at> | Sat Feb  1 19:04:37 2014 +0100| [b66a0dce117a89db304b82dc2498c9a70c7dcecd] | committer: Michael Niedermayer

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 at gmx.at>
(cherry picked from commit b51e9354772de446e8196dabf9aad1567b22f74d)

Signed-off-by: Michael Niedermayer <michaelni at gmx.at>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=b66a0dce117a89db304b82dc2498c9a70c7dcecd
---

 libavcodec/vc1.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/libavcodec/vc1.c b/libavcodec/vc1.c
index 95ac93c..0120b8e 100644
--- a/libavcodec/vc1.c
+++ b/libavcodec/vc1.c
@@ -580,6 +580,8 @@ 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);
     skip_bits(gb, 2); //framecnt unused