Fix memory corruption

5 years ago · 5bf7c4dd34
parent 1299f11d18
commit 5bf7c4dd34
1 changed files with 2 additions and 1 deletions
--- a/widgetstyle/basestyle.cpp
+++ b/widgetstyle/basestyle.cpp
@ -4289,7 +4289,8 @@ QSize BaseStyle::sizeFromContents(ContentsType type,
    }
    case CT_Slider: {
        QSize sz = size;
-        if (qobject_cast<const QSlider*>(widget)->orientation() == Qt::Horizontal) {
+        // mitigate zero-pointer dereference
+        if (!widget || qobject_cast<const QSlider*>(widget)->orientation() == Qt::Horizontal) {
            sz.setHeight(sz.height() + PM_SliderTickmarkOffset);
        } else {
            sz.setWidth(sz.width() + PM_SliderTickmarkOffset);