https://bugs.gentoo.org/959851
https://www.qt.io/blog/security-advisory-recently-reported-denial-of-service-issue-in-qcolortransfergenericfunction-impacts-qt
https://codereview.qt-project.org/c/qt/qtbase/+/657023
--- a/src/gui/painting/qcolortransfergeneric_p.h
+++ b/src/gui/painting/qcolortransfergeneric_p.h
@@ -19,2 +19,3 @@
 
+#include <algorithm>
 #include <cmath>
@@ -67,2 +68,3 @@
     {
+        x = std::clamp(x, 0.f, 12.f);
         if (x > 1.f)
@@ -75,2 +77,3 @@
     {
+        x = std::clamp(x, 0.f, 1.f);
         if (x < 0.5f)
@@ -88,2 +91,3 @@
     {
+        e = std::clamp(e, 0.f, 1.f);
         // m2-th root of E'
@@ -101,2 +105,3 @@
     {
+        fd = std::clamp(fd, 0.f, 64.f);
         // scale Fd to Y