[erlang-questions] zlib deflate problem

Sverker Eriksson <>
Fri May 23 11:13:07 CEST 2008


Yes, I have tested this myself now with some extra tracing. It is 
absolutely a bug not handling the non fatal error case of Z_BUF_ERROR. A 
fix will be included in R12B-3. I will do some more investigating, but 
as it looks now it will be the patch you suggested, Matthew.

/Sverker, Erlang/OTP Ericsson

Matthew Dempsky wrote:
> Has there been any further internal discussion on this patch?  I just
> stumbled across this same bug as well.
>
> On Wed, May 21, 2008 at 12:55 AM, Sverker Eriksson
> <> wrote:
>   
>> Matthew Dempsky wrote:
>>     
>>> On Tue, May 20, 2008 at 10:43 AM, Colm Dougan <> wrote:
>>>
>>>       
>>>> Matthew - I tried your patch and it worked.   I don't see any
>>>> regression but I haven't done extensive testing. If you think this is
>>>> the appropriate fix (rather than an exploratory patch) then I can
>>>> install the patched erlang on my running system and do more testing.
>>>>
>>>>         
>>> I think it should be safe for more testing.
>>>
>>>
>>>       
>> Hi guys
>>
>> I've been looking at your patch Matthew, trying to understand it to
>> decide if it should be part of the next OTP release. Do you have any
>> more arguments why this would be the right way to do it?
>>
>>     
>>> --- zlib_drv.c.orig   2008-05-19 19:09:00.000000000 -0700
>>> +++ zlib_drv.c        2008-05-19 19:09:12.000000000 -0700
>>> @@ -257,6 +257,10 @@
>>>               driver_deq(d->port, len);
>>>               return res;
>>>           }
>>> +         if (res == Z_BUF_ERROR) {
>>> +             res = Z_OK;
>>> +         }
>>>           if (res < 0) {
>>>               return res;
>>>           }
>>>       
>> As I understand it, a return of Z_BUF_ERROR from inflate() means
>> something like "call me again with more buffer space". But in this case
>> we don't call again.
>>
>> Do you have any more light to shed?
>>
>> /Sverker, Erlang/OTP Ericsson
>>
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>>
>>     




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