Fix crashes when accssing invalid indexes

Change-Id: I412490ded92803daaf6d5a1850e53b6072a42e7d
Reviewed-by: Christiaan Janssen <christiaan.janssen@digia.com>

plugins/qmlprofiler/qmlprofilerpainteventsmodelproxy.cpp

@@ -229,12 +229,12 @@ const QString PaintEventsModelProxy::categoryLabel(int categoryIndex) const
 int PaintEventsModelProxy::findFirstIndex(qint64 startTime) const
 {
     if (d->eventList.isEmpty())
-        return 0; // -1
+        return -1;
     if (d->eventList.count() == 1 || d->eventList.first().startTime+d->eventList.first().duration >= startTime)
         return 0;
     else
         if (d->eventList.last().startTime+d->eventList.last().duration <= startTime)
-            return 0; // -1
+            return -1;
 
     int fromIndex = 0;
     int toIndex = d->eventList.count()-1;
@@ -256,9 +256,9 @@ int PaintEventsModelProxy::findFirstIndexNoParents(qint64 startTime) const
 int PaintEventsModelProxy::findLastIndex(qint64 endTime) const
 {
         if (d->eventList.isEmpty())
-            return 0; // -1
+            return -1;
         if (d->eventList.first().startTime >= endTime)
-            return 0; // -1
+            return -1;
         if (d->eventList.count() == 1)
             return 0;
         if (d->eventList.last().startTime <= endTime)

plugins/qmlprofiler/qmlprofilertimelinemodelproxy.cpp

@@ -452,12 +452,12 @@ int BasicTimelineModel::findFirstIndex(qint64 startTime) const
     int candidate = -1;
     // in the "endtime" list, find the first event that ends after startTime
     if (d->endTimeData.isEmpty())
-        return 0; // -1
+        return -1;
     if (d->endTimeData.count() == 1 || d->endTimeData.first().endTime >= startTime)
         candidate = 0;
     else
         if (d->endTimeData.last().endTime <= startTime)
-            return 0; // -1
+            return -1;
 
     if (candidate == -1)
     {
@@ -484,12 +484,12 @@ int BasicTimelineModel::findFirstIndexNoParents(qint64 startTime) const
     int candidate = -1;
     // in the "endtime" list, find the first event that ends after startTime
     if (d->endTimeData.isEmpty())
-        return 0; // -1
+        return -1;
     if (d->endTimeData.count() == 1 || d->endTimeData.first().endTime >= startTime)
         candidate = 0;
     else
         if (d->endTimeData.last().endTime <= startTime)
-            return 0; // -1
+            return -1;
 
     if (candidate == -1) {
         int fromIndex = 0;
@@ -514,9 +514,9 @@ int BasicTimelineModel::findLastIndex(qint64 endTime) const
 {
         // in the "starttime" list, find the last event that starts before endtime
         if (d->startTimeData.isEmpty())
-            return 0; // -1
+            return -1;
         if (d->startTimeData.first().startTime >= endTime)
-            return 0; // -1
+            return -1;
         if (d->startTimeData.count() == 1)
             return 0;
         if (d->startTimeData.last().startTime <= endTime)

plugins/qmlprofiler/timelinerenderer.cpp

@@ -83,14 +83,16 @@ void TimelineRenderer::paint(QPainter *p, const QStyleOptionGraphicsItem *, QWid
 
     for (int modelIndex = 0; modelIndex < m_profilerModelProxy->modelCount(); modelIndex++) {
         int lastIndex = m_profilerModelProxy->findLastIndex(modelIndex, m_endTime);
-        if (lastIndex < m_profilerModelProxy->count(modelIndex)) {
+        if (lastIndex >= 0 && lastIndex < m_profilerModelProxy->count(modelIndex)) {
             int firstIndex = m_profilerModelProxy->findFirstIndex(modelIndex, m_startTime);
+            if (firstIndex >= 0) {
                 drawItemsToPainter(p, modelIndex, firstIndex, lastIndex);
                 if (m_selectedModel == modelIndex)
                     drawSelectionBoxes(p, modelIndex, firstIndex, lastIndex);
                 drawBindingLoopMarkers(p, modelIndex, firstIndex, lastIndex);
             }
         }
+    }
     m_lastStartTime = m_startTime;
     m_lastEndTime = m_endTime;
 
@@ -311,7 +313,8 @@ void TimelineRenderer::manageHovered(int x, int y)
     // find if there's items in the time range
     int eventFrom = m_profilerModelProxy->findFirstIndex(modelIndex, time);
     int eventTo = m_profilerModelProxy->findLastIndex(modelIndex, time);
-    if (eventTo < eventFrom || eventTo >= m_profilerModelProxy->count()) {
+    if (eventFrom == -1 ||
+            eventTo < eventFrom || eventTo >= m_profilerModelProxy->count()) {
         m_currentSelection.eventIndex = -1;
         return;
     }
@@ -457,7 +460,8 @@ void TimelineRenderer::selectPrev()
     int candidateModelIndex = -1;
     qint64 candidateStartTime = m_profilerModelProxy->traceStartTime();
     for (int i = 0; i < m_profilerModelProxy->modelCount(); i++) {
-        if (itemIndexes[i] == -1)
+        if (itemIndexes[i] == -1
+                || itemIndexes[i] >= m_profilerModelProxy->count(i))
             continue;
         qint64 newStartTime = m_profilerModelProxy->getStartTime(i, itemIndexes[i]);
         if (newStartTime < searchTime && newStartTime > candidateStartTime) {
@@ -493,6 +497,8 @@ int TimelineRenderer::nextItemFromId(int modelIndex, int eventId) const
         ndx = m_profilerModelProxy->findFirstIndexNoParents(modelIndex, m_startTime);
     else
         ndx = m_selectedItem + 1;
+    if (ndx < 0)
+        return -1;
     if (ndx >= m_profilerModelProxy->count(modelIndex))
         ndx = 0;
     int startIndex = ndx;