[FFmpeg-devel] [PATCH 4/6] avformat/mvdec: Fix DoS due to lack of eof check

[Michael Niedermayer]

Fixes: loop.mv

Found-by: Xiaohei and Wangchu from Alibaba Security Team
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
---
 libavformat/mvdec.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libavformat/mvdec.c b/libavformat/mvdec.c
index 0e12c8c6c1..f7aa4cbaec 100644
--- a/libavformat/mvdec.c
+++ b/libavformat/mvdec.c
@@ -342,6 +342,8 @@ static int mv_read_header(AVFormatContext *avctx)
             uint32_t pos   = avio_rb32(pb);
             uint32_t asize = avio_rb32(pb);
             uint32_t vsize = avio_rb32(pb);
+            if (avio_feof(pb))
+                return AVERROR_INVALIDDATA;
             avio_skip(pb, 8);
             av_add_index_entry(ast, pos, timestamp, asize, 0, AVINDEX_KEYFRAME);
             av_add_index_entry(vst, pos + asize, i, vsize, 0, AVINDEX_KEYFRAME);
-- 
2.14.1