diff --git a/libavformat/rtpdec_xiph.c b/libavformat/rtpdec_xiph.c
index a09653f340..8492865b4f 100644
--- a/libavformat/rtpdec_xiph.c
+++ b/libavformat/rtpdec_xiph.c
@@ -88,7 +88,7 @@ static int xiph_handle_packet(AVFormatContext *ctx, PayloadContext *data,
         return data->split_pkts > 0;
     }
 
-    if (len < 6) {
+    if (len < 6 || len > INT_MAX/2) {
         av_log(ctx, AV_LOG_ERROR, "Invalid %d byte packet\n", len);
         return AVERROR_INVALIDDATA;
     }