[FFmpeg-devel] [PATCH 2/3] avformat/mov: Check element count in mov_metadata_hmmt()

[Michael Niedermayer]

Fixes: Timeout
Fixes: 30325/clusterfuzz-testcase-minimized-ffmpeg_dem_MOV_fuzzer-6048395703746560

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
---
 libavformat/mov.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libavformat/mov.c b/libavformat/mov.c
index 9ca0a3ee15..2a701e9f70 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -288,6 +288,8 @@ static int mov_metadata_hmmt(MOVContext *c, AVIOContext *pb, unsigned len)
         return 0;
 
     n_hmmt = avio_rb32(pb);
+    if (n_hmmt > len / 4)
+        return AVERROR_INVALIDDATA;
     for (i = 0; i < n_hmmt && !pb->eof_reached; i++) {
         int moment_time = avio_rb32(pb);
         avpriv_new_chapter(c->fc, i, av_make_q(1, 1000), moment_time, AV_NOPTS_VALUE, NULL);
-- 
2.17.1