[FFmpeg-cvslog] avcodec/interplayvideo: check that video_size is >0

[Paul B Mahol]

ffmpeg | branch: master | Paul B Mahol <onemda at gmail.com> | Wed Jun 28 16:59:59 2017 +0200| [42f516b5d356a1fe9945dfe770a4f62ce62f3080] | committer: Paul B Mahol

avcodec/interplayvideo: check that video_size is >0

Fixes #6498.

Signed-off-by: Paul B Mahol <onemda at gmail.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=42f516b5d356a1fe9945dfe770a4f62ce62f3080
---

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

diff --git a/libavcodec/interplayvideo.c b/libavcodec/interplayvideo.c
index 2ac2f991a6..04cc91a060 100644
--- a/libavcodec/interplayvideo.c
+++ b/libavcodec/interplayvideo.c
@@ -1233,6 +1233,8 @@ static int ipvideo_decode_frame(AVCodecContext *avctx,
             s->decoding_map_size = ((s->avctx->width / 8) * (s->avctx->height / 8)) * 2;
             s->decoding_map = buf + 8 + 14; /* 14 bits of op data */
             video_data_size -= s->decoding_map_size + 14;
+            if (video_data_size <= 0)
+                return AVERROR_INVALIDDATA;
 
             if (buf_size < 8 + s->decoding_map_size + 14 + video_data_size)
                 return AVERROR_INVALIDDATA;