Dynamic arrays: using realloc() without memory leaks

by

If realloc() fails it returns NULL.

So if you do (and assuming realloc() would fail)

result = realloc(result, ...);

result will be assigned NULL and what it pointed to is not free()ed and the address to be free()ed is lost.

To fix this do:

{
  void * tmp = realloc(result, ...);
  if (NULL == tmp)
  {
    /* Handle error case, propably freeing what result is pointing to. */
  }
  else
  {
    result = tmp;
  }
}

More Related Contents:

  1. Can you tell me specific what this program is doing? [closed]
  2. Malloc , Realloc , Memset : Struct pointers , arrays of char, int
  3. Proper usage of realloc()
  4. What does malloc(0) return? [duplicate]
  5. How to handle realloc when it fails due to memory?
  6. Using realloc to shrink the allocated memory
  7. How do realloc and memcpy work?
  8. realloc(): invalid next size when reallocating to make space for strcat on char * [duplicate]
  9. Does realloc overwrite old contents?
  10. Recommended way to track down array out-of-bound access/write in C program
  11. Is it safe to use realloc?
  12. Bit manipulation, return 0 if x != 0, or nonzero otherwise
  13. Cascaded and nested if statements in C programming language
  14. Inserting linked list at the end [closed]
  15. How to clear input buffer in C?
  16. Correct format specifier for double in printf
  17. How do I work with dynamic multi-dimensional arrays in C?
  18. Case Insensitive String Comparison in C
  19. What is __stdcall?
  20. What does #x inside a C macro mean?
  21. Recommended gcc warning options for C [closed]
  22. How can I run a C program on Mac OS X using Terminal?
  23. How to solve “ptrace operation not permitted” when trying to attach GDB to a process?
  24. Two Equal Signs in One Line?
  25. How to use kbhit and getch (C programming) [closed]
  26. Scanf causes C program to crash
  27. Centering strings with printf()
  28. How can I fix the scanf to take data into the array?
  29. dyld: Library not loaded: ….. How to correctly tell GCC Compiler where to find another static library?
  30. Difference between scanf() and strtol() / strtod() in parsing numbers

Leave a Comment