Sanitize font weight value in QSvgFontStyle::apply

Assigning values outside the enum's range is undefined.
Fixes oss-fuzz issue 29432.

Pick-to: 6.0
Change-Id: I31f4d64a15803b13a3cb8dc07702da24ca74ebc2
Reviewed-by: Jonas Karlsson <jonas.karlsson@qt.io>
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@qt.io>

1 files changed, 3 insertions, 1 deletions

diff --git a/src/svg/qsvgstyle.cpp b/src/svg/qsvgstyle.cpp
index cf17944..e82d89c 100644
--- a/src/svg/qsvgstyle.cpp
+++ b/src/svg/qsvgstyle.cpp
@@ -263,7 +263,9 @@ void QSvgFontStyle::apply(QPainter *p, const QSvgNode *, QSvgExtraStates &states
         } else {
             states.fontWeight = m_weight;
         }
-        font.setWeight(QFont::Weight(states.fontWeight));
+        font.setWeight(QFont::Weight(qBound(static_cast<int>(QFont::Weight::Thin),
+                                            states.fontWeight,
+                                            static_cast<int>(QFont::Weight::Black))));
     }
 
     p->setFont(font);