Java assignment declaration valid or invalid [on hold]

Question: Why are the following assignments all invalid? Please can you explain why for each individual assignment. I had thought one or two of them were okay given we imported toyPackage.

Given the classes below, indicate whether the assignments are valid or invalid. Notice that we are using two packages.

package toyPackage; public class Toy { protected int size; static int max; public static final int temp = 10; }

package experiment; import toyPackage.*;

public class Driver { public static void main(String[] args) { Toy p = new Toy(); p.size = 10; /* Invalid / p.max = 20; / Invalid / Toy.max = 30; / Invalid / Toy.temp = 40; / Invalid */ } }

What are the security implications of invalid free()?


CVE-2009-5030

OpenJPEG: Heap memory corruption leading to invalid free

The tcd_free_encode function in tcd.c in OpenJPEG 1.3 through 1.5 allows remote attackers to cause a denial of service (memory corruption) and possibly execute arbitrary code via crafted tile information in a Gray16 TIFF image, which causes insufficient memory to be allocated and leads to an “invalid free”.


What are the security implications of the invalid free? How might it be abused or exploited in a security context?

My interest in information security eventually led to an interest in computer science in general, not the other way around: always being less interested in cause than effect.

I recently began trying my hand at writing C code. It’s going alright, but still amateur at best. Many of the lower level programming concepts (e.g. heap, memory management, etc.) continue to elude me to a certain extent.

I’m not particularly interested in the specific example provided above. It’s just the most recent example (although patched long ago) to inadvertently come across my desk. Anyway, it’s a term I’m all too familiar with, from reading and writing reports, yet I have no more than a vague or abstract understanding of what it really implies. Despite the frequency of occurrence, it seems considerably neglected in the common literature. The reports for the CVE above mention remote arbitrary code execution, but it seems to be in addition to the invalid free – the relationship is unclear.


Similar Terms

  • Double Free
  • Use After Free

Getting error>: ‘invalid use of non-static member function’ when passing a child class method to a father (public-inherited) method

Hope everybody is doing just fine.

I’m writing this piece of code where i have a class called XZStage (child) that inherits every public method from the library/class SerialCommand (father) and on a method of the XZStage i’m passing to a father method, a child method as argument.

The error i’m getting is: ‘invalid use of non-static member function’

A little piece of advice to do a refined search would be great.

What’s the best practice for screen navigation after invalid user input?

Consider an Angular app with many user inputs over screens A, B and C. Screen C needs valid inputs from A and B; B from A only; and A is independent. Suppose while on screen B the user enters invalid inputs.

Question: What navigation should I support for B in this case?

My current thinking is to disallow navigation to C due to data validity issues. But what about navigating back to B? On the one hand, there are no validity issues, and the user may want to look up screen A to help with screen B inputs. On the other hand, this would complicate the app’s state management. An alternative is to disallow such navigation, possibly with an option to restore the last valid inputs at B. As I lack experience in UX, I’d appreciate answers to help me with this trade-off.

The URL is invalid. It may refer to a nonexistent file or folder, or refer to a valid file or folder that is not in the current Web?

I am trying to upload documents to SharePoint 2010 site and i am getting the following error.

The URL ‘aaa.pdf’ is invalid. It may refer to a nonexistent file or folder, or refer to a valid file or folder that is not in the current Web

How can i fix it ?

Booting Kernel Failed: Invalid Argument (Non-VM)

Backstory: I have been trying to install Ubuntu the last few days, but I have been facing problems. First, I had to change the File System of my Ubuntu USB and then after that I am facing this problem.

What happened?: I launched the Ubuntu Installer with my USB and then say an accessibility icon and a keyboard when booting. Right after, I saw a black screen saying “Booting Kernel Failed: Invalid Argument”. I can confirm that my install of the iso is not corrupted with qBitTorrent confirming it. Also my USB is not the problem. I used Rufus’ dd mode to install Ubuntu on the drive to keep it in FAT. Also, I tried using my USB on a Chromebook but just stated a “Graphics Initialization Problem” message. I also tried writing help and enter but it did not boot.

Mounting /cow on root failed: Invalid argument overlay mount failed

I am using an xps 13 9365, which was data wiped from bios by a friend who then gave it to me thinking it was dead. I tried booting with a USB (current LTS distro (18.04 or similar)) boot disk and got into the language selection / setup menu. By using the F6 option I selected noapic. In bios sata is set to raid and legacy the secure boot option is off.

But when I try to install I get kicked into a tiny font window with the following message

(initramfs) mount: Mounting /cow on root failed: Invalid argument overlay mount failed

Any ideas?

ERROR: gcloud crashed (UnicodeDecodeError): ‘utf8’ codec can’t decode byte 0xc8 in position 145: invalid continuation byte

I have installed SDK and try to do gcloud init but i am getting below error.

can anyone please help on this.

khumansingh@DESKTOP-97PCNCB:~$ gcloud init Welcome! This command will take you through the configuration of gcloud.

Your current configuration has been set to: [default]

You can skip diagnostics next time by using the following flag: gcloud init –skip-diagnostics

Network diagnostic detects and fixes local network connection issues. Checking network connection…done. Reachability Check passed. Network diagnostic passed (1/1 checks passed).

ERROR: gcloud crashed (UnicodeDecodeError): ‘utf8’ codec can’t decode byte 0xc8 in position 145: invalid continuation byte

If you would like to report this issue, please run the following command: gcloud feedback

To check gcloud for common problems, please run the following command: gcloud info –run-diagnostics

Invalid URL in field “id”

Invalid URL in field "id"

I am getting this error in google search console. Since this error showed up a couple weeks ago, my search traffic dropped from 5000 to 500.

Here is the page that is getting the error. https://scabiesremedy.com/author/jpiscool/page/2/
The funny thing is that I can’t find this page on my website, except through this direct url.

Any help would be greatly appreciated.
Thank you