[FFmpeg-cvslog] avcodec/vp3: Call ff_progress_frame_unref() before ff_progress_frame_get_buffer()

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Fri Apr 26 23:46:38 2024 +0200| [d9699464c3b2b2b02f21d60ead49c8eb829052fb] | committer: Michael Niedermayer

avcodec/vp3: Call ff_progress_frame_unref() before ff_progress_frame_get_buffer()

Fixes: Assertion !f->f && !f->progress failed at libavcodec/decode.c:1688
Fixes: 68190/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_THEORA_fuzzer-5942090287611904

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Andreas Rheinhardt <andreas.rheinhardt at outlook.com>
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=d9699464c3b2b2b02f21d60ead49c8eb829052fb
---

 libavcodec/vp3.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/libavcodec/vp3.c b/libavcodec/vp3.c
index 2a5f68dfa8..0952760776 100644
--- a/libavcodec/vp3.c
+++ b/libavcodec/vp3.c
@@ -2651,6 +2651,7 @@ static int vp3_decode_frame(AVCodecContext *avctx, AVFrame *frame,
     if (avctx->skip_frame >= AVDISCARD_NONKEY && !s->keyframe)
         return buf_size;
 
+    ff_progress_frame_unref(&s->current_frame);
     ret = ff_progress_frame_get_buffer(avctx, &s->current_frame,
                                        AV_GET_BUFFER_FLAG_REF);
     if (ret < 0) {