[omniORB] omniORB 4.0.3 client side memory leak?

[Jochen Behrens]

Hi Mike,

I think it's not a bug. Out parameters always must be initialized on 
server side. This is especially necessary for all kind of 
variable-length parameters. If you do not allocate memory and 
initialize  the output string on server-side, the underlying ORB trys to 
marshall the string at the uninitialized position and runs into the 
observed problem (COMM_FAILURE).  On client side the proxy allocates 
memory while unmarshalling the request results. Hence, the caller is 
responsible to deallocate it.

Jochen

Mike Bendickson wrote:

> In porting some code from omniORB 2.8.0 to 4.0.3, my client is getting 
> exceptions and leaking memory.
>
> Here is the offending code:
>
> IDL:
>
> .
> .
> .
>         short test_outStrParamNotReturned(out string p_sTestOut);
> .
> .
> .
>
> The server impl looks something like this:
>
> CORBA::Short
> #if defined(_USE_OMNIORB280)
> CIOmniORBImpl::test_outStrParamNotReturned(char *& p_sTestOut)
> #elif defined(_USE_OMNIORB403)
> CIOmniORBImpl::test_outStrParamNotReturned(CORBA::String_out p_sTestOut)
> #endif
> {
>     std::cout << "Executing test_outStrParamNotReturned(...)" << 
> std::endl;
> //  p_sTestOut = CORBA::string_dup("test_outStrParamNotReturned");
>     return (0);
> }
>
> Note that string_dup is commented out.  With 2.8, no client exception 
> is thrown, and no leak is apparent.
>
> In 4.0.3, I get a COMM_FAILURE exception, and it leaks memory (client 
> side leak).
>
> It's easily fixed by making sure that I always initialize the output 
> string, but it seems like it might be a bug so I thought I'd report it.
>
> -Mike
>
> _______________________________________________
> omniORB-list mailing list
> omniORB-list at omniorb-support.com
> http://www.omniorb-support.com/mailman/listinfo/omniorb-list
> - - - - - - - DISCLAIMER - - - - - - - -
> Unless indicated otherwise, the information contained in this message 
> is privileged and confidential, and is intended only for the use of 
> the addressee(s) named above and others who have been specifically 
> authorized to receive it. If you are not the intended recipient, you 
> are hereby notified that any dissemination, distribution or copying of 
> this message and/or attachments is strictly prohibited. The company 
> accepts no liability for any damage caused by any virus transmitted by 
> this email. Furthermore, the company does not warrant a proper and 
> complete transmission of this information, nor does it accept 
> liability for any delays. If you have received this message in error, 
> please contact the sender and delete the message. Thank you.
>


-- 
-----------------------------------
Jochen Behrens
Software Engineer

Barco Orthogon AG
Hastedter Osterdeich 222
28207 Bremen

Tel +49-421-20122-447
Fax +49-421-20122-999
www.barco-orthogon.com
Jochen.Behrens at barco.com