linux-kernel - Re: [PATCH 036/190] Revert "vfio/mdev: Fix reference count leak in add_mdev_supported

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Date:   Wed, 21 Apr 2021 17:03:59 -0600
From:   Alex Williamson <alex.williamson@...hat.com>
To:     Jason Gunthorpe <jgg@...dia.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, Qiushi Wu <wu000273@....edu>,
        Cornelia Huck <cohuck@...hat.com>,
        Kirti Wankhede <kwankhede@...dia.com>
Subject: Re: [PATCH 036/190] Revert "vfio/mdev: Fix reference count leak in
 add_mdev_supported_type"

On Wed, 21 Apr 2021 15:36:34 -0300
Jason Gunthorpe <jgg@...dia.com> wrote:

> On Wed, Apr 21, 2021 at 02:58:31PM +0200, Greg Kroah-Hartman wrote:
> > This reverts commit aa8ba13cae3134b8ef1c1b6879f66372531da738.
> > 
> > Commits from @umn.edu addresses have been found to be submitted in "bad
> > faith" to try to test the kernel community's ability to review "known
> > malicious" changes.  The result of these submissions can be found in a
> > paper published at the 42nd IEEE Symposium on Security and Privacy
> > entitled, "Open Source Insecurity: Stealthily Introducing
> > Vulnerabilities via Hypocrite Commits" written by Qiushi Wu (University
> > of Minnesota) and Kangjie Lu (University of Minnesota).
> > 
> > Because of this, all submissions from this group must be reverted from
> > the kernel tree and will need to be re-reviewed again to determine if
> > they actually are a valid fix.  Until that work is complete, remove this
> > change to ensure that no problems are being introduced into the
> > codebase.
> > 
> > Cc: Qiushi Wu <wu000273@....edu>
> > Cc: Cornelia Huck <cohuck@...hat.com>
> > Cc: Kirti Wankhede <kwankhede@...dia.com>
> > Cc: Alex Williamson <alex.williamson@...hat.com>
> > Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> > ---
> >  drivers/vfio/mdev/mdev_sysfs.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)  
> 
> I recently audited all of this mdev stuff, the original patch is OK,
> though I would have written it with a goto. Please don't revert it.

Agreed, the original commit looks correct.  Thanks,

Alex