In _lx_nand_flash_block_find
/* Check the address range. */ if (block_mapping_index > nand_flash -> lx_nand_flash_block_mapping_table_size / sizeof(*nand_flash -> lx_nand_flash_block_mapping_table))
should be changed to
/* Check the address range. */ if (block_mapping_index >= nand_flash -> lx_nand_flash_block_mapping_table_size / sizeof(*nand_flash -> lx_nand_flash_block_mapping_table))