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diff -up qtsvg-everywhere-src-5.15.2/src/svg/qsvghandler.cpp.orig qtsvg-everywhere-src-5.15.2/src/svg/qsvghandler.cpp
--- qtsvg-everywhere-src-5.15.2/src/svg/qsvghandler.cpp.orig	2020-10-27 09:02:11.000000000 +0100
+++ qtsvg-everywhere-src-5.15.2/src/svg/qsvghandler.cpp	2021-03-09 17:48:50.187425243 +0100
@@ -65,6 +65,7 @@
 #include "private/qmath_p.h"
 
 #include "float.h"
+#include <cmath>
 
 QT_BEGIN_NAMESPACE
 
@@ -672,6 +673,9 @@ 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 +3047,8 @@ static QSvgStyleProperty *createRadialGr
         ncy = toDouble(cy);
     if (!r.isEmpty())
         nr = toDouble(r);
+    if (nr < 0.5)
+        nr = 0.5;
 
     qreal nfx = ncx;
     if (!fx.isEmpty())