From 21acc56d578821bdf2ae8e9ec06fabe18b2f12cc Mon Sep 17 00:00:00 2001
From: Eli Fidler <efidler@topologyinc.com>
Date: Tue, 31 May 2016 14:03:07 -0400
Subject: [PATCH] range check in IsLosslessFloat to avoid undefined
 double->float cast

UBSAN gave in Value.IsLosslessFloat:
include/rapidjson/document.h:981:38: runtime error: value 3.40282e+38 is outside the range of representable values of type 'float'
---
 include/rapidjson/document.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/rapidjson/document.h b/include/rapidjson/document.h
index f1857f5..b0162f5 100644
--- a/include/rapidjson/document.h
+++ b/include/rapidjson/document.h
@@ -978,6 +978,9 @@ public:
     bool IsLosslessFloat() const {
         if (!IsNumber()) return false;
         double a = GetDouble();
+        if (a < static_cast<double>(-std::numeric_limits<float>::max())
+                || a > static_cast<double>(std::numeric_limits<float>::max()))
+            return false;
         double b = static_cast<double>(static_cast<float>(a));
         return a >= b && a <= b;    // Prevent -Wfloat-equal
     }