Once you have obtained a memory leak report, follow these guidelines for fixing the memory leaks:
Most importantly, determine where the leak is. The leak report tells you the allocation trace of the leaked block, the place where the leaked block was allocated.
You can then look at the execution flow of your program and see how the block was used. If it is obvious where the pointer was lost, the job is easy; otherwise you can use showleaks to narrow your leak window. By default, the showleaks command lists the new leaks created only since the last showleaks command. You can run showleaks repeatedly while stepping through your program to narrow the window where the block was leaked.
For more information, see showleaks Command.