From 8ca20673a5f540b4e02b5da8082181ef222778a3 Mon Sep 17 00:00:00 2001
From: Dan Abramov <dan.abramov@gmail.com>
Date: Wed, 1 Aug 2018 19:15:15 +0100
Subject: [PATCH] Fix SSR crash on a hasOwnProperty attribute

---
 .../src/__tests__/ReactServerRendering-test.js      | 13 +++++++++++++
 .../react-dom/src/server/ReactPartialRenderer.js    |  3 ++-
 packages/react-dom/src/shared/DOMProperty.js        |  5 +++--
 3 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/packages/react-dom/src/__tests__/ReactServerRendering-test.js b/packages/react-dom/src/__tests__/ReactServerRendering-test.js
index 9c6c8c29eea6..0e605f8c6ecc 100644
--- a/packages/react-dom/src/__tests__/ReactServerRendering-test.js
+++ b/packages/react-dom/src/__tests__/ReactServerRendering-test.js
@@ -174,6 +174,19 @@ describe('ReactDOMServer', () => {
           (__DEV__ ? '\n    in iframe (at **)' : ''),
       );
     });
+
+    it('should not crash on poisoned hasOwnProperty', () => {
+      let html;
+      expect(
+        () =>
+          (html = ReactDOMServer.renderToString(
+            <div hasOwnProperty="poison">
+              <span unknown="test" />
+            </div>,
+          )),
+      ).toWarnDev(['React does not recognize the `hasOwnProperty` prop']);
+      expect(html).toContain('<span unknown="test">');
+    });
   });
 
   describe('renderToStaticMarkup', () => {
diff --git a/packages/react-dom/src/server/ReactPartialRenderer.js b/packages/react-dom/src/server/ReactPartialRenderer.js
index 357eb8eb8ea5..19bf9c94a7f2 100644
--- a/packages/react-dom/src/server/ReactPartialRenderer.js
+++ b/packages/react-dom/src/server/ReactPartialRenderer.js
@@ -349,6 +349,7 @@ function processContext(type, context) {
   return maskedContext;
 }
 
+const hasOwnProperty = Object.prototype.hasOwnProperty;
 const STYLE = 'style';
 const RESERVED_PROPS = {
   children: null,
@@ -368,7 +369,7 @@ function createOpenTagMarkup(
   let ret = '<' + tagVerbatim;
 
   for (const propKey in props) {
-    if (!props.hasOwnProperty(propKey)) {
+    if (!hasOwnProperty.call(props, propKey)) {
       continue;
     }
     let propValue = props[propKey];
diff --git a/packages/react-dom/src/shared/DOMProperty.js b/packages/react-dom/src/shared/DOMProperty.js
index 31f222b97885..23a00b48a59b 100644
--- a/packages/react-dom/src/shared/DOMProperty.js
+++ b/packages/react-dom/src/shared/DOMProperty.js
@@ -66,14 +66,15 @@ export const VALID_ATTRIBUTE_NAME_REGEX = new RegExp(
   '^[' + ATTRIBUTE_NAME_START_CHAR + '][' + ATTRIBUTE_NAME_CHAR + ']*$',
 );
 
+const hasOwnProperty = Object.prototype.hasOwnProperty;
 const illegalAttributeNameCache = {};
 const validatedAttributeNameCache = {};
 
 export function isAttributeNameSafe(attributeName: string): boolean {
-  if (validatedAttributeNameCache.hasOwnProperty(attributeName)) {
+  if (hasOwnProperty.call(validatedAttributeNameCache, attributeName)) {
     return true;
   }
-  if (illegalAttributeNameCache.hasOwnProperty(attributeName)) {
+  if (hasOwnProperty.call(illegalAttributeNameCache, attributeName)) {
     return false;
   }
   if (VALID_ATTRIBUTE_NAME_REGEX.test(attributeName)) {