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

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Date:	Thu, 28 Apr 2016 11:09:13 +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 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>

/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);