memory leak(win32 api)

gistfile1.cpp

#include <windows.h>
#include <cstring>
#include <vector>
#include <cstdlib>
#include <ctime>
#include <iostream>
using namespace std;

int main(int argc, char const *argv[]){
	while(true) {
		Sleep(1000);

		const unsigned size = 1024 * 1024; //MB

		char *buf;
		try{
			buf = (char*)VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE | PAGE_NOCACHE);
			if(!buf) throw;
		} catch(...) {
			cerr << "bat alloc!" << endl;
			continue;
		}
		FillMemory(buf, size, -1);
	}
	return 0;
}