Fix Self-Referencing OOPIF Infinite Loop

content/browser/frame_host/navigation_handle_impl.cc

Index: content/browser/frame_host/navigation_handle_impl.cc
diff --git a/content/browser/frame_host/navigation_handle_impl.cc b/content/browser/frame_host/navigation_handle_impl.cc
index 74e0b202c6f005ffc79bb32c909b01bb847c83f2..655aa5bce847c9fbc2feb8af2a010cbaa615ee15 100644
--- a/content/browser/frame_host/navigation_handle_impl.cc
+++ b/content/browser/frame_host/navigation_handle_impl.cc
@@ -509,6 +509,12 @@ void NavigationHandleImpl::WillStartRequest(
   state_ = WILL_SEND_REQUEST;
   complete_callback_ = callback;
 
+  if (IsSelfReferentialURL()) {
+    state_ = CANCELING;
+    RunCompleteCallback(NavigationThrottle::CANCEL);
+    return;
+  }
+
   RegisterNavigationThrottles();
 
   if (IsBrowserSideNavigationEnabled())
@@ -551,6 +557,12 @@ void NavigationHandleImpl::WillRedirectRequest(
   state_ = WILL_REDIRECT_REQUEST;
   complete_callback_ = callback;
 
+  if (IsSelfReferentialURL()) {
+    state_ = CANCELING;
+    RunCompleteCallback(NavigationThrottle::CANCEL);
+    return;
+  }
+
   // Notify each throttle of the request.
   NavigationThrottle::ThrottleCheckResult result = CheckWillRedirectRequest();
 
@@ -889,4 +901,29 @@ void NavigationHandleImpl::RegisterNavigationThrottles() {
                     std::make_move_iterator(throttles_to_register.end()));
 }
 
+bool NavigationHandleImpl::IsSelfReferentialURL() {
+  // about: URLs should be exempted since they are reserved for other purposes
+  // and cannot be the source of infinite recursion. See
+  // https://crbug.com/341858 .
+  if (url_.SchemeIs("about"))
+    return false;
+
+  // Browser-triggered navigations should be exempted.
+  if (!is_renderer_initiated_)
+    return false;
+
+  // We allow one level of self-reference because some sites depend on that,
+  // but we don't allow more than one.
+  bool found_self_reference = false;
+  for (const FrameTreeNode* node = frame_tree_node_->parent(); node;
+       node = node->parent()) {
+    if (node->current_url().EqualsIgnoringRef(url_)) {
+      if (found_self_reference)
+        return true;
+      found_self_reference = true;
+    }
+  }
+  return false;
+}
+
 }  // namespace content