linux-kernel - Re: [PATCH 5.10 042/103] net/rds: Avoid potential use after free in rds_send_remove_from

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Message-ID: <YH6BAD4rgBjDANgO@kroah.com>
Date:   Tue, 20 Apr 2021 09:21:36 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Pavel Machek <pavel@...x.de>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Aditya Pakki <pakki001@....edu>,
        Santosh Shilimkar <santosh.shilimkar@...cle.com>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>
Subject: Re: [PATCH 5.10 042/103] net/rds: Avoid potential use after free in
 rds_send_remove_from_sock

On Mon, Apr 19, 2021 at 11:29:30PM +0200, Pavel Machek wrote:
> Hi!
> 
> > [ Upstream commit 0c85a7e87465f2d4cbc768e245f4f45b2f299b05 ]
> > 
> > In case of rs failure in rds_send_remove_from_sock(), the 'rm' resource
> > is freed and later under spinlock, causing potential use-after-free.
> > Set the free pointer to NULL to avoid undefined behavior.
> 
> This patch is crazy. Take a look at Message-ID:
> <20210419084953.GA28564@amd>. Or just look at the patch :-).

You are correct, everything submitted from this author and domain
recently was done as a "research project" to see if they could mess with
kernel maintainers and slip in pointless changes to the kernel.

Not acceptable at all...

greg k-h