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avcodec/vc1: reset fcm/field_mode in non advanced header parsing

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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>
(cherry picked from commit b51e9354772de446e8196dabf9aad1567b22f74d)

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-02-01 19:04:37 +01:00
parent c598a46821
commit b66a0dce11
1 changed files with 2 additions and 0 deletions
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libavcodec/vc1.c
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@ -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