vc1_parser: fix NULL pointer dereference

Fixes Ticket456 Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2011-12-01 18:35:58 +01:00 · 2011-12-01 18:35:58 +01:00 · b50be4e38d
parent d9cc6bb432
commit b50be4e38d
1 changed files with 2 additions and 0 deletions
--- 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;