[FFmpeg-cvslog] avcodec/ulti: Check number of blocks at init

Michael Niedermayer git at videolan.org
Sat Jan 20 22:35:19 EET 2018


ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Mon Jan 15 19:03:48 2018 +0100| [725353525e73bbe5b6b4d01528252675f2417a02] | committer: Michael Niedermayer

avcodec/ulti: Check number of blocks at init

Fixes: Timeout
Fixes: 4832/clusterfuzz-testcase-4699096590843904

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=725353525e73bbe5b6b4d01528252675f2417a02
---

 libavcodec/ulti.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libavcodec/ulti.c b/libavcodec/ulti.c
index e6f4374981..9e4c088b10 100644
--- a/libavcodec/ulti.c
+++ b/libavcodec/ulti.c
@@ -50,6 +50,8 @@ static av_cold int ulti_decode_init(AVCodecContext *avctx)
     s->width = avctx->width;
     s->height = avctx->height;
     s->blocks = (s->width / 8) * (s->height / 8);
+    if (s->blocks == 0)
+        return AVERROR_INVALIDDATA;
     avctx->pix_fmt = AV_PIX_FMT_YUV410P;
     s->ulti_codebook = ulti_codebook;
 



More information about the ffmpeg-cvslog mailing list