Subject: Re: memory leak in _libssh2_channel_open

Re: memory leak in _libssh2_channel_open

From: Steven Dake <>
Date: Fri, 24 Feb 2012 10:14:07 -0700

On 02/24/2012 09:15 AM, Peter Stuge wrote:
> Steven Dake wrote:
>> I'll be happy to try out your patch later today and report results back
>> sometime this weekend.
> Thanks!
>>> Please see if the attached patch fixes the leak while still allowing
>>> your program to keep running for a long time. I'm not completely sure
>>> if the payload would need to be freed explicitly in _session_free()
>> I had thought along these same lines, but the problem with freeing in
>> sesson_free is that I don't free my session unless the connection is
>> determined faulty. I could free and create a new session occasionally
>> to hack around that, but seems like there should be a better way ;)
> No, freeing session->payload in libssh2_session_free() is not the
> solution to your problem, but it may be needed to properly clean up.
>> one packet leaked is ok (with me), thousands not ok (current codebase).
> One packet leaked is not ok with me.


I tried this patch and it resulted in double free followed by segfault
from gcc memory checker.

>> I'm here to help with finding any bugs/leaks/etc with libssh2. I
>> can even help fix them - I've studied the code base for about 12
>> hours so have a reasonable idea of how it operates.
> All good. Looking forward to results from testing the patch.
> //Peter
> _______________________________________________
> libssh2-devel

Received on 2012-02-24