Fixed a crash on Windows 7 systems with invalid PrinterPorts entries.

Some Windows 7 systems appear to have invalid entries in the
PrinterPorts registry key. It's supposed to contain 3 entries, but
some return a single value.

Task-number: QTBUG-9938
Reviewed-by: Kim

1 files changed, 4 insertions, 3 deletions

diff --git a/src/gui/painting/qprintengine_win.cpp b/src/gui/painting/qprintengine_win.cpp
index 374bfa0..76dad72 100644
--- a/src/gui/painting/qprintengine_win.cpp
+++ b/src/gui/painting/qprintengine_win.cpp
@@ -964,12 +964,13 @@ void QWin32PrintEnginePrivate::queryDefault()
         return;
 
     QStringList info = output.split(QLatin1Char(','));
-    if (info.size() > 0) {
+    int infoSize = info.size();
+    if (infoSize > 0) {
         if (name.isEmpty())
             name = info.at(0);
-        if (program.isEmpty())
+        if (program.isEmpty() && infoSize > 1)
             program = info.at(1);
-        if (port.isEmpty())
+        if (port.isEmpty() && infoSize > 2)
             port = info.at(2);
     }
 }