[FFmpeg-cvslog] avcodec/vc1dec: ff_print_debug_info() does not support WMV3 field_mode

[Michael Niedermayer]

ffmpeg | branch: release/4.4 | Michael Niedermayer <michael at niedermayer.cc> | Sun Aug  8 20:46:32 2021 +0200| [82fe7775a8cd59f2a576b11db38ff9515c04bd1e] | committer: Michael Niedermayer

avcodec/vc1dec: ff_print_debug_info() does not support WMV3 field_mode

Fixes: out of array read
Fixes: 36331/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_WMV3_fuzzer-5140494328922112.fuzz

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit c59b5e3d1e0121ea23b5b326529f5bdca44cf982)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=82fe7775a8cd59f2a576b11db38ff9515c04bd1e
---

 libavcodec/vc1dec.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/libavcodec/vc1dec.c b/libavcodec/vc1dec.c
index d822240cff..d4ceb60791 100644
--- a/libavcodec/vc1dec.c
+++ b/libavcodec/vc1dec.c
@@ -1154,12 +1154,14 @@ image:
         if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
             if ((ret = av_frame_ref(pict, s->current_picture_ptr->f)) < 0)
                 goto err;
-            ff_print_debug_info(s, s->current_picture_ptr, pict);
+            if (!v->field_mode)
+                ff_print_debug_info(s, s->current_picture_ptr, pict);
             *got_frame = 1;
         } else if (s->last_picture_ptr) {
             if ((ret = av_frame_ref(pict, s->last_picture_ptr->f)) < 0)
                 goto err;
-            ff_print_debug_info(s, s->last_picture_ptr, pict);
+            if (!v->field_mode)
+                ff_print_debug_info(s, s->last_picture_ptr, pict);
             *got_frame = 1;
         }
     }