* miscfuncs.cc (check_invalid_virtual_addr): New function.

* winsup.h (check_invalid_virtual_addr): Declare.
	* mmap.cc (munmap): Call check_invalid_virtual_addr instead of
	IsBadReadPtr.

winsup/cygwin/mmap.cc

@@ -641,7 +641,7 @@ munmap (void *addr, size_t len)
 
   /* Error conditions according to SUSv3 */
   if (!addr || ((DWORD)addr % getpagesize ()) || !len
-      || IsBadReadPtr (addr, len))
+      || check_invalid_virtual_addr (addr, len))
     {
       set_errno (EINVAL);
       syscall_printf ("-1 = munmap(): Invalid parameters");