wasm: fix network POST data corruption

Emscripten does not like when the post data gets deleted in the local
scope.

Fixes: QTBUG-84685
Pick-to: 5.15
Change-Id: I17f9d5cc3253c26b42253daa68e2fbaccc48eaf6
Reviewed-by: Morten Johan Sørvig <morten.sorvig@qt.io>

2 files changed, 5 insertions, 5 deletions

diff --git a/src/network/access/qnetworkreplywasmimpl.cpp b/src/network/access/qnetworkreplywasmimpl.cpp
index 7cb197c3e5..a1779146f4 100644
--- a/src/network/access/qnetworkreplywasmimpl.cpp
+++ b/src/network/access/qnetworkreplywasmimpl.cpp
@@ -231,11 +231,10 @@ void QNetworkReplyWasmImplPrivate::doSendRequest()
 
     if (outgoingData) { // data from post request
         // handle extra data
-        QByteArray extraData;
-        extraData = outgoingData->readAll(); // is there a size restriction here?
-        if (!extraData.isEmpty()) {
-            attr.requestData = extraData.constData();
-            attr.requestDataSize = extraData.size();
+        requestData = outgoingData->readAll(); // is there a size restriction here?
+        if (!requestData.isEmpty()) {
+            attr.requestData = requestData.data();
+            attr.requestDataSize = requestData.size();
         }
     }
 
diff --git a/src/network/access/qnetworkreplywasmimpl_p.h b/src/network/access/qnetworkreplywasmimpl_p.h
index 0a62e8ad37..f8e532ff98 100644
--- a/src/network/access/qnetworkreplywasmimpl_p.h
+++ b/src/network/access/qnetworkreplywasmimpl_p.h
@@ -135,6 +135,7 @@ public:
 
     QIODevice *outgoingData;
     QSharedPointer<QRingBuffer> outgoingDataBuffer;
+    QByteArray requestData;
 
     void doAbort() const;