test-newdelete-tidy.cpp

#include <cstdlib>
#include <memory>

struct NewDeleteOperators
{
  NewDeleteOperators() = default;

  static void* operator new(size_t size)
  {
    return ::malloc(size);
  }
  static void operator delete(void *p) noexcept
  {
    ::free(p);
  }
};
void testNewDeleteOperators() {
  std::unique_ptr<NewDeleteOperators> op;
  op.reset(new NewDeleteOperators);
}

$ clang-tidy test-newdelete-tidy.cpp
/tmp/test-newdelete-tidy.cpp:20:1: warning: Potential leak of memory pointed to by 'op._M_t._M_t._M_head_impl' [clang-analyzer-unix.Malloc]
}
^
/tmp/test-newdelete-tidy.cpp:19:12: note: Calling 'NewDeleteOperators::operator new'
  op.reset(new NewDeleteOperators);
           ^~~~~~~~~~~~~~~~~~~~~~
/tmp/test-newdelete-tidy.cpp:10:12: note: Memory is allocated
    return ::malloc(size);
           ^~~~~~~~~~~~~~
/tmp/test-newdelete-tidy.cpp:19:12: note: Returning from 'NewDeleteOperators::operator new'
  op.reset(new NewDeleteOperators);
           ^~~~~~~~~~~~~~~~~~~~~~
/tmp/test-newdelete-tidy.cpp:20:1: note: Potential leak of memory pointed to by 'op._M_t._M_t._M_head_impl'
}
^

$ clang --version
clang version 14.0.6
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin