From bfd6ee0d8cf34b63d32adf10ed93daa0086b359f Mon Sep 17 00:00:00 2001
From: Allan Sandfeld Jensen <allan.jensen@qt.io>
Date: Thu, 04 Mar 2021 14:28:48 +0100
Subject: [PATCH] Clamp parsed doubles to float representable values

Parts of our rendering assumes incoming doubles can still be sane
floats.

Pick-to: 6.1 6.0 5.15 5.12
Fixes: QTBUG-91507
Change-Id: I7086a121e1b5ed47695a1251ea90e774dd8f148d
Reviewed-by: Robert Löhning <robert.loehning@qt.io>
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
---

diff --git a/src/svg/qsvghandler.cpp b/src/svg/qsvghandler.cpp
index c937254..c88b6cc 100644
--- a/src/svg/qsvghandler.cpp
+++ b/src/svg/qsvghandler.cpp
@@ -672,6 +672,9 @@ static qreal toDouble(const QChar *&str)
             val = -val;
     } else {
         val = QByteArray::fromRawData(temp, pos).toDouble();
+        // Do not tolerate values too wild to be represented normally by floats
+        if (std::fpclassify(float(val)) != FP_NORMAL)
+            val = 0;
     }
     return val;
 
@@ -3043,6 +3046,8 @@ static QSvgStyleProperty *createRadialGradientNode(QSvgNode *node,
         ncy = toDouble(cy);
     if (!r.isEmpty())
         nr = toDouble(r);
+    if (nr < 0.5)
+        nr = 0.5;
 
     qreal nfx = ncx;
     if (!fx.isEmpty())