Fix crash in QHttpNetworkReplyPrivate::gunzipBodyPartiallyEnd

If a HTTP server responds with gzip-encoded empty content without defining
Content-Length in the response header QHttpNetworkReplyPrivate::gunzipBodyPartiallyEnd
will crash because it calls zlib inflateEnd for an uninitialized stream.

- Fixed the crash by adding a check if the stream is initialized to gunzipBodyPartiallyEnd.
- Added a regression test tst_QNetworkReply::nb279420gzipNoContentLengthEmptyContentDisconnect

PMO 279420
Task-number: QTBUG-22660

Signed-off-by: Sami Rosendahl <sami.rosendahl@reaktor.fi>

Merge-request: 1465
Reviewed-by: Peter Hartmann <peter.hartmann@nokia.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/src/network/access/qhttpnetworkreply.cpp b/src/network/access/qhttpnetworkreply.cpp
index 129e2c6..b926afe 100644
--- a/src/network/access/qhttpnetworkreply.cpp
+++ b/src/network/access/qhttpnetworkreply.cpp
@@ -442,8 +442,10 @@ int QHttpNetworkReplyPrivate::gunzipBodyPartially(QByteArray &compressed, QByteA
 
 void QHttpNetworkReplyPrivate::gunzipBodyPartiallyEnd()
 {
-    inflateEnd(&inflateStrm);
-    initInflate = false;
+    if (initInflate) {
+        inflateEnd(&inflateStrm);
+        initInflate = false;
+    }
 }
 
 #endif