linux-kernel - RE: [PATCH] PCI: hv: Fix a use-after-free bug in hv_eject_device

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Message-ID: <PU1P153MB01698B532ACE934CBD301C62BFE70@PU1P153MB0169.APCP153.PROD.OUTLOOK.COM>
Date:   Fri, 21 Jun 2019 23:31:14 +0000
From:   Dexuan Cui <decui@...rosoft.com>
To:     Michael Kelley <mikelley@...rosoft.com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        KY Srinivasan <kys@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Sasha Levin <Alexander.Levin@...rosoft.com>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "olaf@...fle.de" <olaf@...fle.de>,
        "apw@...onical.com" <apw@...onical.com>,
        "jasowang@...hat.com" <jasowang@...hat.com>,
        vkuznets <vkuznets@...hat.com>,
        "marcelo.cerri@...onical.com" <marcelo.cerri@...onical.com>
CC:     "Lili Deng (Wicresoft North America Ltd)" <v-lide@...rosoft.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "driverdev-devel@...uxdriverproject.org" 
        <driverdev-devel@...uxdriverproject.org>
Subject: RE: [PATCH] PCI: hv: Fix a use-after-free bug in
 hv_eject_device_work()


> From: Michael Kelley <mikelley@...rosoft.com>
> > @@ -1880,6 +1880,7 @@ static void hv_pci_devices_present(struct
> hv_pcibus_device
> > *hbus,
> >  static void hv_eject_device_work(struct work_struct *work)
> >  {
> >  	struct pci_eject_response *ejct_pkt;
> > +	struct hv_pcibus_device *hbus;
> >  	struct hv_pci_dev *hpdev;
> >  	struct pci_dev *pdev;
> >  	unsigned long flags;
> > @@ -1890,6 +1891,7 @@ static void hv_eject_device_work(struct
> work_struct *work)
> >  	} ctxt;
> >
> >  	hpdev = container_of(work, struct hv_pci_dev, wrk);
> > +	hbus = hpdev->hbus;
> 
> In the lines of code following this new assignment, there are four uses of
> hpdev->hbus besides the one at the bottom of the function that causes the
> use-after-free error.  With 'hbus' now available as a local variable, it looks
> rather strange to have those other places still using hpdev->hbus.  I'm
> thinking
> they should be shortened to just 'hbus' for consistency, even though such
> changes aren't directly related to fixing the bug.
> 
> Michael
 
Ok, let me post a v2 for this.

Thanks,
Dexuan