Crash when dragging an empty URL-list.

While converting the mime to native CF_ formats, we need to check the
vaildity of the list.

Task-number: QTBUG-8446
Reviewed-by: Thierry

1 files changed, 7 insertions, 3 deletions

diff --git a/src/gui/kernel/qmime_win.cpp b/src/gui/kernel/qmime_win.cpp
index e191d7b..39633bf 100644
--- a/src/gui/kernel/qmime_win.cpp
+++ b/src/gui/kernel/qmime_win.cpp
@@ -640,14 +640,18 @@ bool QWindowsMimeURI::convertFromMime(const FORMATETC &formatetc, const QMimeDat
         } else if (getCf(formatetc) == CF_INETURL_W) {
             QList<QUrl> urls = mimeData->urls();
             QByteArray result;
-            QString url = urls.at(0).toString();
-            result = QByteArray((const char *)url.utf16(), url.length() * sizeof(ushort));
+            if (!urls.isEmpty()) {
+                QString url = urls.at(0).toString();
+                result = QByteArray((const char *)url.utf16(), url.length() * sizeof(ushort));
+            }
             result.append('\0');
             result.append('\0');
             return setData(result, pmedium);
         } else if (getCf(formatetc) == CF_INETURL) {
             QList<QUrl> urls = mimeData->urls();
-            QByteArray result = urls.at(0).toString().toLocal8Bit();
+            QByteArray result;
+            if (!urls.isEmpty())
+                result = urls.at(0).toString().toLocal8Bit();
             return setData(result, pmedium);
         }
     }