@@ -515,9 +515,11 @@ static int mov_read_dref(MOVContext *c, AVIOContext *pb, MOVAtom atom)

     avio_rb32(pb); // version + flags

     entries = avio_rb32(pb);

-    if (entries >  (atom.size - 1) / MIN_DATA_ENTRY_BOX_SIZE + 1 ||

+    if (!entries ||

+        entries >  (atom.size - 1) / MIN_DATA_ENTRY_BOX_SIZE + 1 ||

         entries >= UINT_MAX / sizeof(*sc->drefs))

         return AVERROR_INVALIDDATA;

+    sc->drefs_count = 0;

     av_free(sc->drefs);

     sc->drefs_count = 0;

     sc->drefs = av_mallocz(entries * sizeof(*sc->drefs));