diff --git a/libavformat/flacdec.c b/libavformat/flacdec.c
index 3060dc45fd..66baba5922 100644
--- a/libavformat/flacdec.c
+++ b/libavformat/flacdec.c
@@ -65,7 +65,8 @@ static int flac_read_header(AVFormatContext *s)
 
     /* process metadata blocks */
     while (!avio_feof(s->pb) && !metadata_last) {
-        avio_read(s->pb, header, 4);
+        if (avio_read(s->pb, header, 4) != 4)
+            return AVERROR(AVERROR_INVALIDDATA);
         flac_parse_block_header(header, &metadata_last, &metadata_type,
                                    &metadata_size);
         switch (metadata_type) {