c - Check if a VirtualAddress was returned by VirtualAlloc

Question

I was wondering if it's possible to determine if a virtual address (pointer) belongs to a previous VirtualAlloc call or not (if possible without writing to the page). Since VirtualFree can automatically set the dwSize value if you use it with MEM_RELEASE.

Answer 1

Something like this or I don't understand the question?

MEMORY_BASIC_INFORMATION mbi;
void* p = NULL;
VirtualQuery(p, &mbi, sizeof(mbi));
BOOL bWasUsed = (mbi.State==MEM_FREE)? FALSE: TRUE;