diff --git a/libavformat/mov.c b/libavformat/mov.c
index 38d44b72db..957af54d22 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);