* util.c (ruby_strtod): check integr overflow.

[ruby-dev:42180] #3789

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@29186 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Mon Sep  6 09:44:50 2010  NARUSE, Yui  <naruse@ruby-lang.org>
+
+	* util.c (ruby_strtod): check integr overflow.
+	  [ruby-dev:42180] #3789
+
 Mon Sep  6 06:17:21 2010  Tanaka Akira  <akr@fsij.org>
 
 	* ext/pathname/pathname.c (path_readable_p): Pathname#readable?

test/ruby/test_float.rb

@@ -448,6 +448,7 @@ class TestFloat < Test::Unit::TestCase
     assert_raise(ArgumentError) { Float("1.0\x001") }
     assert_equal(15.9375, Float('0xf.fp0'))
     assert_raise(ArgumentError) { Float('0xf.fp') }
+    assert_equal(Float::INFINITY, Float('0xf.fp1000000000000000'))
     assert_equal(1, suppress_warning {Float("1e10_00")}.infinite?)
     assert_raise(TypeError) { Float(nil) }
     o = Object.new

util.c

@@ -2149,6 +2149,11 @@ break2:
 		   nd += c;
 		   nd -= '0';
 		   c = *++s;
+		   /* Float("0x0."+("0"*267)+"1fp2095") */
+		   if (abs(nd) > 2095) {
+		       while ('0' <= c && c <= '9') c = *++s;
+		       break;
+		   }
                } while ('0' <= c && c <= '9');
 		dval(rv) = ldexp(adj, nd * dsign);
 	    }