[FFmpeg-cvslog] avformat/cinedec: Fix DoS due to lack of eof check

[孙浩 and 张洪亮(望初)]

ffmpeg | branch: release/3.3 | 孙浩 and 张洪亮(望初) <tony.sh and wangchu.zhl at alibaba-inc.com> | Fri Aug 25 01:15:27 2017 +0200| [4ff1fcd3caa2e59c3d4cec8e4c64c9ac79b09a1d] | committer: Michael Niedermayer

avformat/cinedec: Fix DoS due to lack of eof check

Fixes: loop.cine

Found-by: Xiaohei and Wangchu from Alibaba Security Team
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 7e80b63ecd259d69d383623e75b318bf2bd491f6)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=4ff1fcd3caa2e59c3d4cec8e4c64c9ac79b09a1d
---

 libavformat/cinedec.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/libavformat/cinedec.c b/libavformat/cinedec.c
index 763b93ba2e..de34fb9638 100644
--- a/libavformat/cinedec.c
+++ b/libavformat/cinedec.c
@@ -267,8 +267,12 @@ static int cine_read_header(AVFormatContext *avctx)
 
     /* parse image offsets */
     avio_seek(pb, offImageOffsets, SEEK_SET);
-    for (i = 0; i < st->duration; i++)
+    for (i = 0; i < st->duration; i++) {
+        if (avio_feof(pb))
+            return AVERROR_INVALIDDATA;
+
         av_add_index_entry(st, avio_rl64(pb), i, 0, 0, AVINDEX_KEYFRAME);
+    }
 
     return 0;
 }