[FFmpeg-cvslog] avcodec/cdgraphics: Clear first frame only once

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Sun Jul 15 14:12:56 2018 +0200| [d134b8d85f5e8d1b0778d62455c2e80d5b2e8d66] | committer: Michael Niedermayer

avcodec/cdgraphics: Clear first frame only once

frame_number will not increase if nothing is output

Fixes: Timeout
Fixes: 9057/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_CDGRAPHICS_fuzzer-4844661498707968

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

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=d134b8d85f5e8d1b0778d62455c2e80d5b2e8d66
---

 libavcodec/cdgraphics.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/libavcodec/cdgraphics.c b/libavcodec/cdgraphics.c
index 87ad5e79f4..be85e54288 100644
--- a/libavcodec/cdgraphics.c
+++ b/libavcodec/cdgraphics.c
@@ -69,6 +69,7 @@ typedef struct CDGraphicsContext {
     int hscroll;
     int vscroll;
     int transparency;
+    int cleared;
 } CDGraphicsContext;
 
 static av_cold int cdg_decode_init(AVCodecContext *avctx)
@@ -287,9 +288,10 @@ static int cdg_decode_frame(AVCodecContext *avctx,
 
     if ((ret = ff_reget_buffer(avctx, cc->frame)) < 0)
         return ret;
-    if (!avctx->frame_number) {
+    if (!cc->cleared) {
         memset(cc->frame->data[0], 0, cc->frame->linesize[0] * avctx->height);
         memset(cc->frame->data[1], 0, AVPALETTE_SIZE);
+        cc->cleared = 1;
     }
 
     command = bytestream2_get_byte(&gb);