linux-kernel - Re: vfio: refcount_t: underflow; use-after-free.

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Message-ID: <20200616152853.1f6239f4@x1.home>
Date:   Tue, 16 Jun 2020 15:28:53 -0600
From:   Alex Williamson <alex.williamson@...hat.com>
To:     Daniel Wagner <dwagner@...e.de>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Cornelia Huck <cohuck@...hat.com>
Subject: Re: vfio: refcount_t: underflow; use-after-free.

On Tue, 16 Jun 2020 10:50:52 +0200
Daniel Wagner <dwagner@...e.de> wrote:

> Hi,
> 
> I'm getting the warning below when starting a KVM the second time with an
> Emulex PCI card 'passthroughed' into a KVM. I'm terminating the session
> via 'ctrl-a x', not sure if this is relevant.
> 
> This is with 5.8-rc1. IIRC, older version didn't have this problem.

Thanks for the report, it's a new regression.  I've just posted a fix
for it.  Thanks,

Alex