Fix null pointer dereference in NTLM authentication

If NTLM authentication is required for the URL with an empty path,
then QNetworkAuthenticationCache::findClosestMatch(url.path()) returns 0.
e.g. "http://10.1.2.3".
Return a default constructed credential in this case.

Change-Id: I84ad3b308ee3f74fbbac9ad0f11dbdc66047b50b
Reviewed-by: Robin Burchell <robin+qt@viroteck.net>
Reviewed-by: Martin Petersson <Martin.Petersson@nokia.com>
(cherry picked from commit b830c9cededf995fab1b0919a81658ceaec8d422)

1 files changed, 5 insertions, 2 deletions

diff --git a/src/network/access/qnetworkaccessauthenticationmanager.cpp b/src/network/access/qnetworkaccessauthenticationmanager.cpp
index 1b15cf9..b618ccc 100644
--- a/src/network/access/qnetworkaccessauthenticationmanager.cpp
+++ b/src/network/access/qnetworkaccessauthenticationmanager.cpp
@@ -283,9 +283,12 @@ QNetworkAccessAuthenticationManager::fetchCachedCredentials(const QUrl &url,
 
     QNetworkAuthenticationCache *auth =
         static_cast<QNetworkAuthenticationCache *>(authenticationCache.requestEntryNow(cacheKey));
-    QNetworkAuthenticationCredential cred = *auth->findClosestMatch(url.path());
+    QNetworkAuthenticationCredential *cred = auth->findClosestMatch(url.path());
+    QNetworkAuthenticationCredential ret;
+    if (cred)
+        ret = *cred;
     authenticationCache.releaseEntry(cacheKey);
-    return cred;
+    return ret;
 }
 
 void QNetworkAccessAuthenticationManager::clearCache()