linux-kernel - Re: [PATCH v1] drivers/base/memory: add memory block to memory group after registration succeeded

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Message-Id: <20220131170123.42d7f46ecea0da1cb1579113@linux-foundation.org>
Date:   Mon, 31 Jan 2022 17:01:23 -0800
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     David Hildenbrand <david@...hat.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        stable@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Michal Hocko <mhocko@...e.com>,
        Oscar Salvador <osalvador@...e.de>
Subject: Re: [PATCH v1] drivers/base/memory: add memory block to memory
 group after registration succeeded

On Fri, 28 Jan 2022 15:45:40 +0100 David Hildenbrand <david@...hat.com> wrote:

> If register_memory() fails, we freed the memory block but already added
> the memory block to the group list, not good. Let's defer adding the
> block to the memory group to after registering the memory block device.
> 
> We do handle it properly during unregister_memory(), but that's not
> called when the registration fails.
> 

I guess this has never been known to happen.  So I queued the fix for
5.18-rc1, cc:stable.