Bugs item #7018, was opened at 2006-12-03 02:33
You can respond by visiting:
http://rubyforge.org/tracker/?func=detail&atid=1971&aid=7018&group_id=494
Category: None
Group: None
Status: Open
Resolution: None
Priority: 3
Submitted By: Nobody (None)
Assigned to: Nobody (None)
Summary: Parsing an empty string causes Segfault / Bus Error
Initial Comment:
Running on Mac OS X with libxml-ruby 0.3.8.4, if you try to parse an empty
string you get a segfault.
irb(main):001:0> require 'rubygems'
=> true
irb(main):002:0> require 'xml/libxml'
=> true
irb(main):003:0> string = ''
=> ""
irb(main):004:0> XML::Parser.string(string).parse
(irb):4: [BUG] Bus Error
ruby 1.8.4 (2005-12-24) [i686-darwin8.7.1]
Abort trap
Expected behaviour would be simlar to what a single space character gets:
irb(main):001:0> require 'rubygems'
=> true
irb(main):002:0> require 'xml/libxml'
=> true
irb(main):003:0> string = ' '
=> " "
irb(main):004:0> XML::Parser.string(string).parse
Entity: line 1: parser error : Start tag expected, '<' not found
^
XML::Parser::ParseError: Document didn't parse
from (irb):4:in `parse'
from (irb):4
irb(main):005:0>
----------------------------------------------------------------------
Comment By: Saurabh Nanda (saurabhnanda)
Date: 2008-02-05 19:43
Message:
I see there's a patch submitted for this already. Has this been applied? I'm
running libxml-ruby-0.5.2 and still facing this issue.
----------------------------------------------------------------------
Comment By: Todd Fisher (taf2)
Date: 2006-12-17 19:19
Message:
Here's a patch and test. ctxt is null in the case of nil input...
Index: ext/xml/ruby_xml_parser.c
===================================================================
RCS file: /var/cvs/libxml/libxml/ext/xml/ruby_xml_parser.c,v
retrieving revision 1.5
diff -u -r1.5 ruby_xml_parser.c
--- ext/xml/ruby_xml_parser.c 20 Nov 2006 01:22:07 -0000 1.5
+++ ext/xml/ruby_xml_parser.c 17 Dec 2006 13:45:04 -0000
@@ -1123,7 +1123,9 @@
case RUBY_LIBXML_SRC_TYPE_IO:
Data_Get_Struct(rxp->ctxt, ruby_xml_parser_context, rxpc);
if (xmlParseDocument(rxpc->ctxt) == -1) {
- xmlFreeDoc(rxpc->ctxt->myDoc);
+ if (rxpc->ctxt && rxpc->ctxt->myDoc) {
+ xmlFreeDoc(rxpc->ctxt->myDoc);
+ }
rb_raise(eXMLParserParseError, "Document didn't parse");
}
require "libxml_test"
require 'test/unit'
class EmptyString < Test::Unit::TestCase
def test_parse_empty_string
begin
string = ''
XML::Parser.string(string).parse
rescue => e
assert e, "Document didn't parse"
end
end
end
----------------------------------------------------------------------
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