From: nobu@...
Date: 2015-06-25T10:14:36+00:00
Subject: [ruby-core:69738] [Ruby trunk - Bug #11306] [Third Party's Issue]	Segmentation fault

Issue #11306 has been updated by Nobuyoshi Nakada.

Description updated
Status changed from Open to Third Party's Issue

A bug of that gem.

----------------------------------------
Bug #11306: Segmentation fault
https://bugs.ruby-lang.org/issues/11306#change-53119

* Author: David Anderson
* Status: Third Party's Issue
* Priority: Normal
* Assignee: 
* ruby -v: ruby 2.2.1p85 (2015-02-26 revision 49769) [x86_64-linux]
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN
----------------------------------------
bug is detected during CUPS call in cups gem (https://github.com/m0wfo/cups) v0.1.10. The complete core dump is attached as file 'dump.txt'.

the following works okay:

~~~
2.2.1 :001 > list = Cups.show_destinations
 => ["laserjet_1102w", "lp_null"] 
2.2.1 :002 > Cups.device_uri_for( list.first )
 => "hp:/net/HP_LaserJet_Professional_P_1102w?ip=192.168.0.65" 
2.2.1 :003 > Cups.device_uri_for( list.last )
 => "file:///dev/null" 
~~~

the following fails (the order is not important; the second call always fails with abort):

~~~
2.2.1 :001 > list = Cups.show_destinations
 => ["laserjet_1102w", "lp_null"] 
2.2.1 :002 > CupsDevice.testit( list.first )
 => "hp:/net/HP_LaserJet_Professional_P_1102w?ip=192.168.0.65" 
2.2.1 :003 > CupsDevice.testit( list.last )
/home/daudi/projectspace/swalapala/app/models/cups_device.rb:101: [BUG] Segmentation fault at 0x0000000a491862
ruby 2.2.1p85 (2015-02-26 revision 49769) [x86_64-linux]
~~~
where:

~~~ruby
class CupsDevice < ActiveRecord::Base
  def self.testit( cups_name )
       Cups.device_uri_for( cups_name )
  end
end # class CupsDevice
~~~

and in the cups gem:

~~~c
  rb_define_singleton_method(rubyCups, "device_uri_for", cups_get_device_uri, 1);


static VALUE cups_get_device_uri(VALUE self, VALUE printer)
{
   if (!printer_exists(printer))
   {
     rb_raise(rb_eRuntimeError, "The printer or destination doesn't exist!");
   }

   VALUE options_list;
   http_t *http;
   ipp_t *request;
   ipp_t *response;
   ipp_attribute_t *attr;
   char uri[1024];
   char *location;
   char *name = RSTRING_PTR(printer);

   request = ippNewRequest(IPP_GET_PRINTER_ATTRIBUTES);
   httpAssembleURIf(HTTP_URI_CODING_ALL, uri, sizeof(uri), "ipp", NULL, "localhost", 0, "/printers/%s", name);
   ippAddString(request, IPP_TAG_OPERATION, IPP_TAG_URI, "printer-uri", NULL, uri);

   if ((response = cupsDoRequest(http, request, "/")) != NULL)
   {
     if((attr = ippFindAttribute(response, "device-uri", IPP_TAG_URI)) != NULL)
     {
       return rb_str_new2(attr->values[0].string.text);
     }
     ippDelete(response);
   }
   return Qtrue;
}
~~~

---Files--------------------------------
dump.txt (206 KB)
cups_device.rb (3.43 KB)
cups.c (14.2 KB)


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