Valgrind is a GPL'd tool to help you find memory-management problems in
your programs.  When a program is run under Valgrind's supervision, all
reads and writes of memory are checked, and calls to
malloc/new/free/delete are intercepted.  As a result, Valgrind can
detect problems such as:

   * Use of uninitialised memory
   * Reading/writing memory after it has been free'd
   * Reading/writing off the end of malloc'd blocks
   * Reading/writing inappropriate areas on the stack
   * Memory leaks -- where pointers to malloc'd blocks are lost forever
   * Passing of uninitialised and/or unaddressible memory to system calls
   * Mismatched use of malloc/new/new [] vs free/delete/delete []
   * Overlaps of arguments to strcpy() and related functions
   * Some abuses of the POSIX pthread API

• Sergey Vlasov
• Alexander Bokovoy

• valgrind
• valgrind-devel
• valgrind-tool-devel