linux-kernel - Re: use-after-free in srpt_enable

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Message-ID: <fbaca135-891c-7ff3-d7ac-bd79609849f5@oracle.com>
Date:   Thu, 30 Jun 2022 11:40:30 -0500
From:   Mike Christie <michael.christie@...cle.com>
To:     Bart Van Assche <bvanassche@....org>
Cc:     "lizhijian@...itsu.com" <lizhijian@...itsu.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Leon Romanovsky <leon@...nel.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "target-devel@...r.kernel.org" <target-devel@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: use-after-free in srpt_enable_tpg()

On 6/27/22 11:37 AM, Bart Van Assche wrote:
> On 6/27/22 00:09, lizhijian@...itsu.com wrote:
>> So far, I doubt if the previous defect of configfs mentioned in
>> 9b64f7d0b: "(RDMA/srpt: Postpone HCA removal until after configfs
>> directory removal)" has got a better solution. if not, i have no a
>> clear mechanism to avoid it yet.
>>
>> feedbacks are very welcome.
> Mike, are you perhaps aware of any plans to add functions to the LIO core for removing tpg and wwn objects?
> 

I don't know any work being done in this area. I was only working
on the refcounting/configfs parts for sessions in those configfs/sysfs
patchsets. However, I think I hit similar issues with the session.
I went around the world with solutions but didn't really like them
so I never pushed the patches for inclusion.

What was the hang caused by 9b64f7d0bb0a?