/* 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) {