From 40a355a42d4a9444dc753c04c6608dade2f06a23 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Fri, 19 Apr 2024 03:13:27 +0200
Subject: Adding upstream version 125.0.1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 dom/base/IDTracker.cpp | 25 +++++++++++++++++++++----
 1 file changed, 21 insertions(+), 4 deletions(-)

(limited to 'dom/base/IDTracker.cpp')

diff --git a/dom/base/IDTracker.cpp b/dom/base/IDTracker.cpp
index 4db592534d..813aa44e11 100644
--- a/dom/base/IDTracker.cpp
+++ b/dom/base/IDTracker.cpp
@@ -132,13 +132,30 @@ void IDTracker::ResetWithLocalRef(Element& aFrom, const nsAString& aLocalRef,
                                   bool aWatch) {
   MOZ_ASSERT(nsContentUtils::IsLocalRefURL(aLocalRef));
 
-  nsAutoCString ref;
-  if (!AppendUTF16toUTF8(Substring(aLocalRef, 1), ref, mozilla::fallible)) {
+  auto ref = Substring(aLocalRef, 1);
+  if (ref.IsEmpty()) {
     Unlink();
     return;
   }
-  NS_UnescapeURL(ref);
-  RefPtr<nsAtom> idAtom = NS_Atomize(ref);
+
+  nsAutoCString utf8Ref;
+  if (!AppendUTF16toUTF8(ref, utf8Ref, mozilla::fallible)) {
+    Unlink();
+    return;
+  }
+
+  // Only unescape ASCII characters; if we were to unescape arbitrary bytes,
+  // we'd potentially end up with invalid UTF-8.
+  nsAutoCString unescaped;
+  bool appended;
+  if (NS_FAILED(NS_UnescapeURL(utf8Ref.BeginReading(), utf8Ref.Length(),
+                               esc_OnlyASCII | esc_AlwaysCopy, unescaped,
+                               appended, mozilla::fallible))) {
+    Unlink();
+    return;
+  }
+
+  RefPtr<nsAtom> idAtom = NS_Atomize(unescaped);
   ResetWithID(aFrom, idAtom, aWatch);
 }
 
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