[ruby-core:64956] [ruby-trunk - Bug #10223] Stack level too deep in CSV when parsing long line

Issue #10223 has been updated by Nobuyoshi Nakada.

Description updated
Priority changed from High to Normal
Target version set to current: 2.2.0
Backport changed from 2.0.0: UNKNOWN, 2.1: UNKNOWN to 2.0.0: REQUIRED, 2.1: REQUIRED

Shortest code would be:

~~~ruby
def t;yield [0]*200000; end
t{|a,|}
~~~

----------------------------------------
Bug #10223: Stack level too deep in CSV when parsing long line
https://bugs.ruby-lang.org/issues/10223#change-48841

* Author: Aleksander Pohl
* Status: Open
* Priority: Normal
* Assignee: 
* Category: core
* Target version: current: 2.2.0
* ruby -v: ruby 1.9.2p290 (2011-07-09 revision 32553) [x86_64-linux], ruby 2.1.2p95 (2014-05-08 revision 45877) [x86_64-linux]
* Backport: 2.0.0: REQUIRED, 2.1: REQUIRED
----------------------------------------
The following code:

~~~ruby
#!/usr/bin/env ruby                                                                                                                                                        
# encoding: utf-8

require 'bundler/setup'
require 'csv'

CSV.open("csv_error.csv") do |input|
  input.each do |category,*mappings|
    # do nothing
  end
end
~~~

with the data file attached causes the follwing error:

~~~
/usr/local/rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/csv.rb:1768: stack level too deep (SystemStackError)
~~~

Interestingly almost the same code:

~~~ruby
#!/usr/bin/env ruby                                                                                                                                                        
# encoding: utf-8

require 'bundler/setup'
require 'csv'

CSV.open("csv_error.csv") do |input|
  input.each do |tuple|
    # do nothing
  end
end
~~~

works fine. The error appears both in Ruby 1.9.2 (ancient) and Ruby 2.1.2. So I suppose it is an error inside CSV lib.


This might be important for any developer parsing CSV files comming from the outside world, since it may cause DOS error.

---Files--------------------------------
csv_error.csv (2.1 MB)


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