[FFmpeg-cvslog] avcodec/vp56: Consider the alpha start as end of the prior header

[Michael Niedermayer]

ffmpeg | branch: release/4.2 | Michael Niedermayer <michael at niedermayer.cc> | Tue Aug  6 23:30:02 2019 +0200| [fc902dd374751b19e69c62b0ecc9c53bf78e9560] | committer: Michael Niedermayer

avcodec/vp56: Consider the alpha start as end of the prior header

Fixes: Timeout (23sec -> 71ms)
Fixes: 15661/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_VP6A_fuzzer-6257865947348992

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Peter Ross <pross at xvid.org>
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit db78bc1297ebaa51cfe5c80775808ec11ed7512b)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=fc902dd374751b19e69c62b0ecc9c53bf78e9560
---

 libavcodec/vp56.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/libavcodec/vp56.c b/libavcodec/vp56.c
index 72fea3780e..695f37e972 100644
--- a/libavcodec/vp56.c
+++ b/libavcodec/vp56.c
@@ -572,7 +572,7 @@ int ff_vp56_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
     VP56Context *s = avctx->priv_data;
     AVFrame *const p = s->frames[VP56_FRAME_CURRENT];
     int remaining_buf_size = avpkt->size;
-    int av_uninit(alpha_offset);
+    int alpha_offset = remaining_buf_size;
     int i, res;
     int ret;
 
@@ -585,7 +585,7 @@ int ff_vp56_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
             return AVERROR_INVALIDDATA;
     }
 
-    res = s->parse_header(s, buf, remaining_buf_size);
+    res = s->parse_header(s, buf, alpha_offset);
     if (res < 0)
         return res;