From 97ec67a0ad8b51d781e04a64f09a077336d2a5c0 Mon Sep 17 00:00:00 2001
From: Mirko Brodesser <mbrodesser@mozilla.com>
Date: Tue, 21 Jul 2020 15:12:06 +0000
Subject: [PATCH] Bug 1649121: part 54) Assert range boundaries in
 `ContentIteratorBase::Initializer` are set and valid. r=masayuki

Differential Revision: https://phabricator.services.mozilla.com/D83968
---
 dom/base/ContentIterator.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/dom/base/ContentIterator.cpp b/dom/base/ContentIterator.cpp
index c2c6d91a7ec9..99048d39504b 100644
--- a/dom/base/ContentIterator.cpp
+++ b/dom/base/ContentIterator.cpp
@@ -188,7 +188,10 @@ class MOZ_STACK_CLASS ContentIteratorBase::Initializer final {
       : mIterator{aIterator},
         mStart{aStart},
         mEnd{aEnd},
-        mStartIsCharacterData{mStart.Container()->IsCharacterData()} {}
+        mStartIsCharacterData{mStart.Container()->IsCharacterData()} {
+    MOZ_ASSERT(mStart.IsSetAndValid());
+    MOZ_ASSERT(mEnd.IsSetAndValid());
+  }
 
   nsresult Run();