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QGraphicsWidget: Check for nullptrs in focus chain handling 

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

Pick-to: 6.1
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>
bb10
Volker Hilsheimer 2021-02-25 17:04:06 +01:00
parent 98db996576
commit 95e34f7fbc
1 changed files with 4 additions and 2 deletions
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6
src/widgets/graphicsview/qgraphicswidget_p.cpp
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@ -784,7 +784,8 @@ void QGraphicsWidgetPrivate::fixFocusChainBeforeReparenting(QGraphicsWidget *new
// detach from current focus chain; skip this widget subtree.
focusBefore->d_func()->focusNext = focusAfter;
focusAfter->d_func()->focusPrev = focusBefore;
if (focusAfter)
focusAfter->d_func()->focusPrev = focusBefore;
if (newParent) {
// attach to new parent's focus chain as the last element
@ -800,7 +801,8 @@ void QGraphicsWidgetPrivate::fixFocusChainBeforeReparenting(QGraphicsWidget *new
newFocusLast->d_func()->focusNext = q;
focusLast->d_func()->focusNext = newFocusAfter;
newFocusAfter->d_func()->focusPrev = focusLast;
if (newFocusAfter)
newFocusAfter->d_func()->focusPrev = focusLast;
focusPrev = newFocusLast;
} else {
// no new parent, so just link up our own prev->last widgets.