[FFmpeg-cvslog] avcodec/webp: Update canvas size in vp8_lossy_decode_frame() as in vp8_lossless_decode_frame()

[Michael Niedermayer]

ffmpeg | branch: release/3.3 | Michael Niedermayer <michael at niedermayer.cc> | Mon May  8 14:43:03 2017 +0200| [0f980302902a7db35253bff282d05d739d7ed6e5] | committer: Michael Niedermayer

avcodec/webp: Update canvas size in vp8_lossy_decode_frame() as in vp8_lossless_decode_frame()

Fixes: 1407/clusterfuzz-testcase-minimized-6044604124102656
Fixes: 1420/clusterfuzz-testcase-minimized-6059927359455232

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 72810d20b74f05cc4b214d6c277fa6f43160df54)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=0f980302902a7db35253bff282d05d739d7ed6e5
---

 libavcodec/webp.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libavcodec/webp.c b/libavcodec/webp.c
index 3fef45603c..ef7b26c4c8 100644
--- a/libavcodec/webp.c
+++ b/libavcodec/webp.c
@@ -1350,6 +1350,9 @@ static int vp8_lossy_decode_frame(AVCodecContext *avctx, AVFrame *p,
     ret = ff_vp8_decode_frame(avctx, p, got_frame, &pkt);
     if (ret < 0)
         return ret;
+
+    update_canvas_size(avctx, avctx->width, avctx->height);
+
     if (s->has_alpha) {
         ret = vp8_lossy_decode_alpha(avctx, p, s->alpha_data,
                                      s->alpha_data_size);