From 43daefb0962794b2df256cae1098e889b9b36f12 Mon Sep 17 00:00:00 2001
From: Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>
Date: Mon, 24 Oct 2016 21:05:28 +0200
Subject: [PATCH] QStringListModel: fix corner-case in sibling()

A negative row can be passed but should not result in a
spurious index returned.

Change-Id: I57f180615020d24826e9b3807557ba172ed469c3
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>
---
 src/corelib/itemmodels/qstringlistmodel.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/corelib/itemmodels/qstringlistmodel.cpp b/src/corelib/itemmodels/qstringlistmodel.cpp
index 0f7472aa5a..da232cc142 100644
--- a/src/corelib/itemmodels/qstringlistmodel.cpp
+++ b/src/corelib/itemmodels/qstringlistmodel.cpp
@@ -131,7 +131,7 @@ int QStringListModel::rowCount(const QModelIndex &parent) const
 */
 QModelIndex QStringListModel::sibling(int row, int column, const QModelIndex &idx) const
 {
-    if (!idx.isValid() || column != 0 || row >= lst.count())
+    if (!idx.isValid() || column != 0 || row >= lst.count() || row < 0)
         return QModelIndex();
 
     return createIndex(row, 0);