From 0e1efcb27309c0893e39bda9fed9dc2964300486 Mon Sep 17 00:00:00 2001
From: Brian Smith <brian@dbsoft.org>
Date: Fri, 29 Sep 2023 09:12:08 -0500
Subject: [PATCH] Issue #1442 - Part 19 - FetchStream must support multiple
 read requests. https://bugzilla.mozilla.org/show_bug.cgi?id=1395220

---
 dom/fetch/FetchStream.cpp | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/dom/fetch/FetchStream.cpp b/dom/fetch/FetchStream.cpp
index fa4802a990..ec224e1c8d 100644
--- a/dom/fetch/FetchStream.cpp
+++ b/dom/fetch/FetchStream.cpp
@@ -185,7 +185,13 @@ FetchStream::RequestDataCallback(JSContext* aCx,
   RefPtr<FetchStream> stream = static_cast<FetchStream*>(aUnderlyingSource);
 
   MOZ_DIAGNOSTIC_ASSERT(stream->mState == eWaiting ||
-                        stream->mState == eChecking);
+                        stream->mState == eChecking ||
+                        stream->mState == eReading);
+
+  if (stream->mState == eReading) {
+    // We are already reading data.
+    return;
+  }
 
   if (stream->mState == eChecking) {
     // If we are looking for more data, there is nothing else we should do: