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Скачать или смотреть How to Fix the malloc Error When Freeing Memory in C

  • vlogize
  • 2025-05-28
  • 1
How to Fix the malloc Error When Freeing Memory in C
Freeing arr returns error malloc: *** error for object pointer being freed was not allocatedmalloc
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Описание к видео How to Fix the malloc Error When Freeing Memory in C

Learn how to troubleshoot and resolve the `malloc: *** error for object pointer being freed was not allocated` error in C programming. This post provides practical solutions with sample code and easy explanations.
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This video is based on the question https://stackoverflow.com/q/65645472/ asked by the user 'SiiilverSurfer' ( https://stackoverflow.com/u/13039935/ ) and on the answer https://stackoverflow.com/a/65645591/ provided by the user 'dbush' ( https://stackoverflow.com/u/1687119/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Freeing arr returns error malloc: *** error for object pointer being freed was not allocated

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
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Understanding the malloc Error in C: A Beginner's Guide

If you're venturing into the world of C programming, you might encounter some common pitfalls, including memory management issues. One such issue is the malloc: *** error for object pointer being freed was not allocated, which can be frustrating when you're trying to implement your logic. Let’s unpack this problem and understand how to fix it effectively!

The Problem: What’s Going Wrong?

In this scenario, you are trying to implement a function called blowUpArray that takes two arrays and their sizes. The goal is to return a new array where the elements from the first array repeat based on the values in the second array. However, you get a memory error when running your program. Here’s the summary of the error message:

[[See Video to Reveal this Text or Code Snippet]]

This message indicates that the program is attempting to free a pointer that was never allocated with malloc, leading to a crash. Let's take a closer look at the code to pinpoint the issue.

Diving into the Code: Understanding Memory Allocation

[[See Video to Reveal this Text or Code Snippet]]

In the function reallocateArr, you are passing an array directly to free, which is where the problem lies:

[[See Video to Reveal this Text or Code Snippet]]

Since arr in the context of blowUpArray is a local variable (in main), freeing it is invalid and results in undefined behavior.

Solution: Fixing the Code

Step 1: Modify the Pointer References

To resolve the error, you need to adjust the pointer handling in your function. Specifically, you should modify which pointer you're trying to free. Instead of attempting to free numArray, you need to free the blownUp array that you intend to grow in size. Modify your function call as follows:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Initialize the Pointer

Before you pass blownUp to the reallocateArr function, make sure to initialize it to NULL. This allows you to safely use free on blownUp during the first iteration when it hasn’t been allocated yet:

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Complete Code Revision

Here’s the revised structure for the blowUpArray function with the changes applied:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion: Key Takeaways

Understanding memory management in C is crucial for avoiding common pitfalls like the malloc error. Here are the essential recommendations based on the steps we covered:

Always ensure you're freeing memory that was allocated and that you don’t attempt to free local variables from the stack.

Initialize pointers to NULL before their first use in memory management contexts.

Carefully pass pointers to functions to manage dynamic memory correctly.

By following these guidelines, you’ll become more proficient in handling memory in your C programs, enabling you to write cleaner, error-free code. Happy coding!

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