linux-kernel - Re: [PATCH 17/29] drivers, pci: convert hv_pci_dev.refs from atomic_t to refcount

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Date:   Tue, 7 Mar 2017 11:58:08 -0800
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Bjorn Helgaas <helgaas@...nel.org>
Cc:     Elena Reshetova <elena.reshetova@...el.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Kees Cook <keescook@...omium.org>, linux-pci@...r.kernel.org,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        linux-kernel@...r.kernel.org, devel@...uxdriverproject.org,
        Hans Liljestrand <ishkamiel@...il.com>,
        David Windsor <dwindsor@...il.com>
Subject: Re: [PATCH 17/29] drivers, pci: convert hv_pci_dev.refs from
 atomic_t to refcount_t

On Mon, 6 Mar 2017 15:38:29 -0600
Bjorn Helgaas <helgaas@...nel.org> wrote:

> [+cc Hyper-V folks, -cc others]
> 
> On Mon, Mar 06, 2017 at 04:21:04PM +0200, Elena Reshetova wrote:
> > refcount_t type and corresponding API should be
> > used instead of atomic_t when the variable is used as
> > a reference counter. This allows to avoid accidental
> > refcounter overflows that might lead to use-after-free
> > situations.
> > 
> > Signed-off-by: Elena Reshetova <elena.reshetova@...el.com>
> > Signed-off-by: Hans Liljestrand <ishkamiel@...il.com>
> > Signed-off-by: Kees Cook <keescook@...omium.org>
> > Signed-off-by: David Windsor <dwindsor@...il.com>


Reviewed-by: Stephen Hemminger <sthemmin@...rosoft.com>