linux-kernel - Re: [PATCH] ALSA: hda/hdmi - Fix duplicate unref of pci

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Date:   Tue, 10 Dec 2019 16:46:49 +0100
From:   Lukas Wunner <lukas@...ner.de>
To:     "Deucher, Alexander" <Alexander.Deucher@....com>
Cc:     Takashi Iwai <tiwai@...e.de>, Jaroslav Kysela <perex@...ex.cz>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Bjorn Helgaas <helgaas@...nel.org>,
        Nicholas Johnson <nicholas.johnson-opensource@...look.com.au>,
        "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>
Subject: Re: [PATCH] ALSA: hda/hdmi - Fix duplicate unref of pci_dev

On Tue, Dec 10, 2019 at 03:34:27PM +0000, Deucher, Alexander wrote:
> > Nicholas Johnson reports a null pointer deref as well as a refcount underflow
> > upon hot-removal of a Thunderbolt-attached AMD eGPU.
> > He's bisected the issue down to commit 586bc4aab878 ("ALSA: hda/hdmi - fix
> > vgaswitcheroo detection for AMD").
> > 
> > The commit iterates over PCI devices using pci_get_class() and unreferences
> > each device found, even though pci_get_class() subsequently unreferences
> > the device as well.  Fix it.
> 
> The pci_dev_put() a few lines above should probably be dropped as well.

That one looks fine to me.  The refcount is already increased in the
caller get_bound_vga() via pci_get_domain_bus_and_slot() and it's
increased again in atpx_present() via pci_get_class().  It needs to
be decremented in atpx_present() to avoid leaking a ref.

Thanks,

Lukas

> > diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c index
> > 35b4526f0d28..b856b89378ac 100644
> > --- a/sound/pci/hda/hda_intel.c
> > +++ b/sound/pci/hda/hda_intel.c
> > @@ -1419,7 +1419,6 @@ static bool atpx_present(void)
> >  				return true;
> >  			}
> >  		}
> > -		pci_dev_put(pdev);
> >  	}
> >  	return false;
> >  }
> > --
> > 2.24.0