Avoid crashing when constructing color-space from invalid enum

This is not to be taken as supported and is still undefined behavior,
but I prefer we do not crash.

Change-Id: Icf4f3398bfd57fcbdc611a5a821a1f2de0838330
Reviewed-by: Eirik Aavitsland <eirik.aavitsland@qt.io>

1 files changed, 4 insertions, 0 deletions

diff --git a/src/gui/painting/qcolorspace.cpp b/src/gui/painting/qcolorspace.cpp
index 9631fdb416..0fb0e9ee33 100644
--- a/src/gui/painting/qcolorspace.cpp
+++ b/src/gui/painting/qcolorspace.cpp
@@ -422,6 +422,10 @@ QColorSpace::QColorSpace()
  */
 QColorSpace::QColorSpace(NamedColorSpace namedColorSpace)
 {
+    if (namedColorSpace < QColorSpace::SRgb || namedColorSpace > QColorSpace::ProPhotoRgb) {
+        qWarning() << "QColorSpace attempted constructed from invalid QColorSpace::NamedColorSpace: " << int(namedColorSpace);
+        return;
+    }
     static QColorSpacePrivate *predefinedColorspacePrivates[QColorSpace::ProPhotoRgb + 1];
     if (!predefinedColorspacePrivates[namedColorSpace]) {
         predefinedColorspacePrivates[namedColorSpace] = new QColorSpacePrivate(namedColorSpace);