[ruby-core:93592] [Ruby master Bug#10961] Zlib corrupts data when receive signal

Issue #10961 has been updated by jeremyevans0 (Jeremy Evans).

Status changed from Open to Closed

It appears this was fixed between ruby 2.3 and 2.4:

```
$ ruby24 /home/jeremy/Downloads/zlib.rb  
62780
generating len=1000000000 string...
string length=1000000000
compressing...
^CINT
decompressing...
true

$ ruby23 /home/jeremy/Downloads/zlib.rb  
78994
generating len=1000000000 string...
string length=1000000000
compressing...
^CINT
/home/jeremy/Downloads/zlib.rb:13:in `deflate': data error (Zlib::DataError)
        from /home/jeremy/Downloads/zlib.rb:13:in `test_string'
        from /home/jeremy/Downloads/zlib.rb:25:in `block in <main>'
        from /home/jeremy/Downloads/zlib.rb:25:in `each'
        from /home/jeremy/Downloads/zlib.rb:25:in `<main>'
```

----------------------------------------
Bug #10961: Zlib corrupts data when receive signal
https://bugs.ruby-lang.org/issues/10961#change-79183

* Author: leiting (Lei Ting)
* Status: Closed
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 2.0.0-p353 2.2.0
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN
----------------------------------------
When receiving signal on main thread, Zlib::Deflate.deflate will be interrupted in zstream_run_func (zlib.c), thus producing unfinished output buffer.

Zlib::Deflate.deflate will return normally, without error, but the return value will be corrupted buffer and can't be decompressed.

Preferred fix: zstream_run() should check if err is Z_STREAM_END, if not, raise an error instead of return normally.

---

run zlib.rb to reproduce this problem:

# ruby zlib.rb
37028
generating len=1000000000 string...
string length=1000000000
compressing...
^CINT (press Ctrl+C or send a signal to the pid)
zlib.rb:13:in `deflate': data error (Zlib::DataError)
        from zlib.rb:13:in `test_string'
        from zlib.rb:25:in `block in <main>'
        from zlib.rb:25:in `each'
        from zlib.rb:25:in `<main>'

---Files--------------------------------
zlib.rb (646 Bytes)


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