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Bug #11306

Updated by nobu (Nobuyoshi Nakada) almost 9 years ago

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; 
 } 
 ~~~

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