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QGraphicsWidget: Check for nullptrs in focus chain handling

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The while loops terminate if focusAfter becomes nullptr (unless we break
earlier), so don't dereference those pointers without checking first.

Fixes static analzyer warnings 979f2d508db4d5838f6c9b296120ce60 and
481f2ec7b5851bf19414478428f944b7

Change-Id: I60fc5999907fe3b3146d7047ee1eff197719ab31
Reviewed-by: David Skoland <david.skoland@qt.io>
Reviewed-by: Oliver Eftevaag <oliver.eftevaag@qt.io>
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@qt.io>
(cherry picked from commit 95e34f7fbc0f2e9ca582278f9a772b27ebf93d5f)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
This commit is contained in:
Volker Hilsheimer 2021-02-25 17:04:06 +01:00 committed by Qt Cherry-pick Bot
parent 2c42df3034
commit 0f269e2494
1 changed files with 4 additions and 2 deletions
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2
src/widgets/graphicsview/qgraphicswidget_p.cpp
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@ -784,6 +784,7 @@ void QGraphicsWidgetPrivate::fixFocusChainBeforeReparenting(QGraphicsWidget *new
// detach from current focus chain; skip this widget subtree.
focusBefore->d_func()->focusNext = focusAfter;
if (focusAfter)
focusAfter->d_func()->focusPrev = focusBefore;
if (newParent) {
@ -800,6 +801,7 @@ void QGraphicsWidgetPrivate::fixFocusChainBeforeReparenting(QGraphicsWidget *new
newFocusLast->d_func()->focusNext = q;
focusLast->d_func()->focusNext = newFocusAfter;
if (newFocusAfter)
newFocusAfter->d_func()->focusPrev = focusLast;
focusPrev = newFocusLast;
} else {