diff --git a/libavcodec/ffwavesynth.c b/libavcodec/ffwavesynth.c
index 94a843e3ca..b319b3341a 100644
--- a/libavcodec/ffwavesynth.c
+++ b/libavcodec/ffwavesynth.c
@@ -247,7 +247,7 @@ static int wavesynth_parse_extradata(AVCodecContext *avc)
     edata_end = edata + avc->extradata_size;
     ws->nb_inter = AV_RL32(edata);
     edata += 4;
-    if (ws->nb_inter < 0)
+    if (ws->nb_inter < 0 || (edata_end - edata) / 24 < ws->nb_inter)
         return AVERROR(EINVAL);
     ws->inter = av_calloc(ws->nb_inter, sizeof(*ws->inter));
     if (!ws->inter)