UnserializeFloat: check result for Inf/NaN

fail in either case

BUG=23488728

Change-Id: I1e65f30ff1cf857a5d1eb4bdedc3f842423cf15f

mkvparser.cpp

@@ -11,6 +11,7 @@
 #include <cstring>
 #include <new>
 #include <climits>
+#include <cmath>
 
 #ifdef _MSC_VER
 // Disable MSVC warnings that suggest making code non-portable.
@@ -206,6 +207,9 @@ long mkvparser::UnserializeFloat(IMkvReader* pReader, long long pos,
     result = d;
   }
 
+  if (std::isinf(result) || std::isnan(result))
+    return E_FILE_FORMAT_INVALID;
+
   return 0;
 }