static int udf_load_partdesc(struct super_block *sb, sector_t block)
{
	struct buffer_head *bh;
	struct partitionDesc *p;
	struct udf_part_map *map;
	struct udf_sb_info *sbi = UDF_SB(sb);
	int i, type1_idx;
	uint16_t partitionNumber;
	uint16_t ident;
	int ret = 0;

	bh = udf_read_tagged(sb, block, block, &ident);
	if (!bh)
		return 1;
	if (ident != TAG_IDENT_PD)
		goto out_bh;

	p = (struct partitionDesc *)bh->b_data;
	partitionNumber = le16_to_cpu(p->partitionNumber);

	/* First scan for TYPE1, SPARABLE and METADATA partitions */
	for (i = 0; i < sbi->s_partitions; i++) {
		map = &sbi->s_partmaps[i];
		udf_debug("Searching map: (%d == %d)\n",
			  map->s_partition_num, partitionNumber);
		if (map->s_partition_num == partitionNumber &&
		    (map->s_partition_type == UDF_TYPE1_MAP15 ||
		     map->s_partition_type == UDF_SPARABLE_MAP15))
			break;
	}

	if (i >= sbi->s_partitions) {
		udf_debug("Partition (%d) not found in partition map\n",
			  partitionNumber);
		goto out_bh;
	}

	ret = udf_fill_partdesc_info(sb, p, i);

	/*
	 * Now rescan for VIRTUAL or METADATA partitions when SPARABLE and
	 * PHYSICAL partitions are already set up
	 */
	type1_idx = i;
	for (i = 0; i < sbi->s_partitions; i++) {
		map = &sbi->s_partmaps[i];

		if (map->s_partition_num == partitionNumber &&
		    (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
		     map->s_partition_type == UDF_VIRTUAL_MAP20 ||
		     map->s_partition_type == UDF_METADATA_MAP25))
			break;
	}

	if (i >= sbi->s_partitions)
		goto out_bh;

	ret = udf_fill_partdesc_info(sb, p, i);
	if (ret)
		goto out_bh;

	if (map->s_partition_type == UDF_METADATA_MAP25) {
		ret = udf_load_metadata_files(sb, i);
		if (ret) {
			udf_err(sb, "error loading MetaData partition map %d\n",
				i);
			goto out_bh;
		}
	} else {
		ret = udf_load_vat(sb, i, type1_idx);
		if (ret)
			goto out_bh;
		/*
		 * Mark filesystem read-only if we have a partition with
		 * virtual map since we don't handle writing to it (we
		 * overwrite blocks instead of relocating them).
		 */
		sb->s_flags |= MS_RDONLY;
		pr_notice("Filesystem marked read-only because writing to pseudooverwrite partition is not implemented\n");
	}
out_bh:
	/* In case loading failed, we handle cleanup in udf_fill_super */
	brelse(bh);
	return ret;
}

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.