linux-kernel - Re: [PATCH] tpm: Fix IRQ unwind ordering in TIS

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Date:	Thu, 28 Apr 2016 11:53:16 +0300
From:	Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
Cc:	Stefan Berger <stefanb@...ux.vnet.ibm.com>,
	linux-security-module@...r.kernel.org,
	tpmdd-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] tpm: Fix IRQ unwind ordering in TIS

On Thu, 2016-04-28 at 11:09 +0300, Jarkko Sakkinen wrote:
> On Wed, 2016-04-27 at 10:58 -0600, Jason Gunthorpe wrote:
> > 
> > The devm for the IRQ was placed on the chip, not the pdev. This can
> > cause the irq to be still callable after the pdev has been cleaned up
> > (eg priv kfree'd).
> >  
> > Found by CONFIG_DEBUG_SHIRQ=y
> >  
> > Reported-by: Stefan Berger <stefanb@...ux.vnet.ibm.com>
> > Fixes: 233a065e0cd0 ("tpm: Get rid of chip->pdev")
> > Signed-off-by: Jason Gunthorpe <jgunthorpe@...idianresearch.com>
> > Tested-by:  Stefan Berger <stefanb@...ux.vnet.ibm.com>
> Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>

And applied  and merged to next.

/Jarkko

> /Jarkko
> 
> > 
> > ---
> >  drivers/char/tpm/tpm_tis.c | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> >  
> > diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c
> > index a6b2d460bfc0..d88827046a42 100644
> > --- a/drivers/char/tpm/tpm_tis.c
> > +++ b/drivers/char/tpm/tpm_tis.c
> > @@ -387,7 +387,7 @@ static void disable_interrupts(struct tpm_chip *chip)
> >  	intmask &= ~TPM_GLOBAL_INT_ENABLE;
> >  	iowrite32(intmask,
> >  		  priv->iobase + TPM_INT_ENABLE(priv->locality));
> > -	devm_free_irq(&chip->dev, priv->irq, chip);
> > +	devm_free_irq(chip->dev.parent, priv->irq, chip);
> >  	priv->irq = 0;
> >  	chip->flags &= ~TPM_CHIP_FLAG_IRQ;
> >  }
> > @@ -604,7 +604,7 @@ static int tpm_tis_probe_irq_single(struct tpm_chip *chip, u32
> > intmask,
> >  	struct priv_data *priv = dev_get_drvdata(&chip->dev);
> >  	u8 original_int_vec;
> >  
> > -	if (devm_request_irq(&chip->dev, irq, tis_int_handler, flags,
> > +	if (devm_request_irq(chip->dev.parent, irq, tis_int_handler, flags,
> >  			     dev_name(&chip->dev), chip) != 0) {
> >  		dev_info(&chip->dev, "Unable to request irq: %d for probe\n",
> >  			 irq);