server: Fix handling of MAXIMUM_ALLOWED in token_access_check.

dlls/advapi32/tests/security.c

@@ -1376,6 +1376,12 @@ static void test_AccessCheck(void)
     ok(AccessStatus && (Access == KEY_READ),
         "AccessCheck failed to grant access with error %d\n",
         GetLastError());
+    ret = AccessCheck(SecurityDescriptor, Token, MAXIMUM_ALLOWED, &Mapping,
+                      PrivSet, &PrivSetLen, &Access, &AccessStatus);
+    ok(ret, "AccessCheck failed with error %d\n", GetLastError());
+    ok(AccessStatus && (Access == KEY_ALL_ACCESS),
+        "AccessCheck failed to grant access with error %d\n",
+        GetLastError());
 
     /* sd with blank dacl */
     ret = SetSecurityDescriptorDacl(SecurityDescriptor, TRUE, Acl, FALSE);

server/token.c

@@ -844,7 +844,10 @@ static unsigned int token_access_check( struct token *token,
     if (!dacl_present || !dacl)
     {
         if (priv_count) *priv_count = 0;
-        *granted_access = desired_access;
+        if (desired_access & MAXIMUM_ALLOWED)
+            *granted_access = mapping->GenericAll;
+        else
+            *granted_access = desired_access;
         return *status = STATUS_SUCCESS;
     }