linux-kernel - Re: [PATCH v2 1/2] nvmet: Fix use-after-free bug when a port is removed

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Message-ID: <786259e6-ffed-8db3-74d0-71ed5a760079@mellanox.com>
Date:   Fri, 5 Jul 2019 00:00:26 +0300
From:   Max Gurtovoy <maxg@...lanox.com>
To:     Logan Gunthorpe <logang@...tatee.com>,
        <linux-kernel@...r.kernel.org>, <linux-nvme@...ts.infradead.org>,
        Christoph Hellwig <hch@....de>,
        "Sagi Grimberg" <sagi@...mberg.me>
CC:     Stephen Bates <sbates@...thlin.com>
Subject: Re: [PATCH v2 1/2] nvmet: Fix use-after-free bug when a port is
 removed

Hi Logan,

On 7/4/2019 2:03 AM, Logan Gunthorpe wrote:
> When a port is removed through configfs, any connected controllers
> are still active and can still send commands. This causes a
> use-after-free bug which is detected by KASAN for any admin command
> that dereferences req->port (like in nvmet_execute_identify_ctrl).
>
> To fix this, disconnect all active controllers when a subsystem is
> removed from a port. This ensures there are no active controllers
> when the port is eventually removed.

so now we are enforcing controller existence with port configfs, right ? 
sounds reasonable.

Did you run your patches with other transport (RDMA/TCP/FC) ?