User Guide

  • 2022.0
  • 05/15/2022
  • Public Content

Invalid Deallocation

Occurs when an application calls a deallocation function with an address that does not correspond to dynamically allocated memory.
Problem type: Invalid deallocation
Code location
Invalid deallocation site
Represents the location from which the invalid call to a deallocation function was made.
C Examples/Windows* OS
int x = 1; int *p = &x; VirtualFree(p, 1, MEM_DECOMMIT);
void *p = VirtualAlloc(NULL,1,MEM_COMMIT,PAGE_READWRITE); VirtualFree(p,1,MEM_DECOMMIT); VirtualFree(p,1,MEM_DECOMMIT);
C Example/Linux* OS
void *p = mmap(NULL, 8, PROT_READ, MAP_PRIVATE | MAP_ANONYMOUS, 0, 0); munmap(p, 8); munmap(p, 8);
Possible Correction Strategies
Do This
This code location should free memory.
Change the code to pass in dynamically allocated memory.
This code location does not need to free memory.
Remove the call to the deallocation function.

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