From b2c0fda7753ce19074e17bf6844c6d78026670ed Mon Sep 17 00:00:00 2001
From: Moonchild <moonchild@palemoon.org>
Date: Wed, 24 Feb 2021 10:13:37 +0000
Subject: [PATCH] [DOM] Don't reveal error details for CORS-cross-origin
 decoding errors.

---
 dom/html/HTMLMediaElement.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/dom/html/HTMLMediaElement.cpp b/dom/html/HTMLMediaElement.cpp
index 0828208f6..1ff1fd7a4 100644
--- a/dom/html/HTMLMediaElement.cpp
+++ b/dom/html/HTMLMediaElement.cpp
@@ -4614,8 +4614,12 @@ void HTMLMediaElement::DecodeError(const MediaResult& aError)
     }
   } else if (mReadyState == nsIDOMHTMLMediaElement::HAVE_NOTHING) {
     NoSupportedMediaSourceError(aError.Description());
-  } else {
+  } else if (IsCORSSameOrigin()) {
     Error(MEDIA_ERR_DECODE, aError.Description());
+  } else {
+    nsAutoCString eMessage;
+    eMessage.AssignLiteral("Failed to decode media");
+    Error(MEDIA_ERR_DECODE, eMessage);
   }
 }