diff --git a/libavformat/asfdec_o.c b/libavformat/asfdec_o.c
index 71e65f4763..3bc53670e3 100644
--- a/libavformat/asfdec_o.c
+++ b/libavformat/asfdec_o.c
@@ -981,6 +981,9 @@ static int asf_read_simple_index(AVFormatContext *s, const GUIDParseTable *g)
     int64_t offset;
     uint64_t size = avio_rl64(pb);
 
+    if (size < 24)
+        return AVERROR_INVALIDDATA;
+
     // simple index objects should be ordered by stream number, this loop tries to find
     // the first not indexed video stream
     for (i = 0; i < asf->nb_streams; i++) {