advapi32: Check NULL return key pointers when creating registry keys.

dlls/advapi32/registry.c

@@ -70,6 +70,9 @@ LSTATUS WINAPI RegOverridePredefKey( HKEY hkey, HKEY override )
  */
 LSTATUS WINAPI RegCreateKeyW( HKEY hkey, LPCWSTR lpSubKey, PHKEY phkResult )
 {
+    if (!phkResult)
+        return ERROR_INVALID_PARAMETER;
+
     return RegCreateKeyExW( hkey, lpSubKey, 0, NULL, REG_OPTION_NON_VOLATILE,
                             MAXIMUM_ALLOWED, NULL, phkResult, NULL );
 }
@@ -82,6 +85,9 @@ LSTATUS WINAPI RegCreateKeyW( HKEY hkey, LPCWSTR lpSubKey, PHKEY phkResult )
  */
 LSTATUS WINAPI RegCreateKeyA( HKEY hkey, LPCSTR lpSubKey, PHKEY phkResult )
 {
+    if (!phkResult)
+        return ERROR_INVALID_PARAMETER;
+
     return RegCreateKeyExA( hkey, lpSubKey, 0, NULL, REG_OPTION_NON_VOLATILE,
                             MAXIMUM_ALLOWED, NULL, phkResult, NULL );
 }

dlls/kernelbase/registry.c

@@ -592,6 +592,7 @@ LSTATUS WINAPI DECLSPEC_HOTPATCH RegCreateKeyExW( HKEY hkey, LPCWSTR name, DWORD
 {
     UNICODE_STRING nameW, classW;
 
+    if (!retkey) return ERROR_BADKEY;
     if (reserved) return ERROR_INVALID_PARAMETER;
     if (!(hkey = get_special_root_hkey( hkey ))) return ERROR_INVALID_HANDLE;
 
@@ -633,6 +634,7 @@ LSTATUS WINAPI DECLSPEC_HOTPATCH RegCreateKeyExA( HKEY hkey, LPCSTR name, DWORD
     ANSI_STRING nameA, classA;
     NTSTATUS status;
 
+    if (!retkey) return ERROR_BADKEY;
     if (reserved) return ERROR_INVALID_PARAMETER;
     if (!is_version_nt())
     {