diff --git a/Xi/xiproperty.c b/Xi/xiproperty.c
index a36f7d61d..68c362c62 100644
--- a/Xi/xiproperty.c
+++ b/Xi/xiproperty.c
@@ -902,6 +902,8 @@ ProcXChangeDeviceProperty(ClientPtr client)
 
     rc = check_change_property(client, stuff->property, stuff->type,
                                stuff->format, stuff->mode, stuff->nUnits);
+    if (rc != Success)
+        return rc;
 
     len = stuff->nUnits;
     if (len > (bytes_to_int32(0xffffffff - sizeof(xChangeDevicePropertyReq))))
@@ -1141,6 +1143,9 @@ ProcXIChangeProperty(ClientPtr client)
 
     rc = check_change_property(client, stuff->property, stuff->type,
                                stuff->format, stuff->mode, stuff->num_items);
+    if (rc != Success)
+        return rc;
+
     len = stuff->num_items;
     if (len > bytes_to_int32(0xffffffff - sizeof(xXIChangePropertyReq)))
         return BadLength;