Top "Free" questions

How to track down a "double free or corruption" error

When I run my (C++) program it crashes with this error. * glibc detected * ./load: double free or corruption (!prev): 0x0000000000…

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How do malloc() and free() work?

I want to know how malloc and free work. int main() { unsigned char *p = (unsigned char*)malloc(4*sizeof(unsigned char)); …

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C free(): invalid pointer

I am teaching myself C. My goal is to make a C function that just walks a query string and …

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What REALLY happens when you don't free after malloc?

This has been something that has bothered me for ages now. We are all taught in school (at least, I …

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double free or corruption (!prev) error in c program

I get the following error when running a c program: *** glibc detected *** ./a.out: double free or corruption (!prev): 0x080…

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Setting variable to NULL after free

In my company there is a coding rule that says, after freeing any memory, reset the variable to NULL. For …

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Does free(ptr) where ptr is NULL corrupt memory?

Theoretically I can say that free(ptr); free(ptr); is a memory corruption since we are freeing the memory which …

c pointers memory-management null free

Understanding "corrupted size vs. prev_size" glibc error

I have implemented a JNA bridge to FDK-AAC. Source code can be found in here When bench-marking my code, I …

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How do free and malloc work in C?

I'm trying to figure out what would happened if I try to free a pointer "from the middle" for example, …

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LinkedList - How to free the memory allocated using malloc

I have a very simple C code for constructing a Singly Linked list as below, in which I allocate memory …

c linked-list malloc free