linux-kernel - Re: [PATCH 1/2] tpm/tpm_ibmvtpm: Fail in ibmvtpm_get_data if driver

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Message-Id: <201412022139.58754.PeterHuewe@gmx.de>
Date:	Tue, 2 Dec 2014 21:39:58 +0100
From:	Peter Hüwe <PeterHuewe@....de>
To:	Anton Blanchard <anton@...ba.org>,
	"Hon Ching (Vicky) Lo" <honclo@...ux.vnet.ibm.com>
Cc:	Ashley Lai <ashley@...leylai.com>,
	Marcel Selhorst <tpmdd@...horst.net>,
	tpmdd-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] tpm/tpm_ibmvtpm: Fail in ibmvtpm_get_data if driver_data is bad

Hi Anton,

is this patchset still needed after Vicky's patch 
"[tpmdd-devel] Fix NULL return in tpm_ibmvtpm_get_desired_dma"
https://patchwork.ozlabs.org/patch/402315/

Ashley raised some concerns.

Since merge window is coming up, a fast reply is appreciated.


Thanks,
Peter

Am Freitag, 19. September 2014, 23:29:42 schrieb Anton Blanchard:
> I'm looking at an oops in tpm_ibmvtpm_get_desired_dma:
> 
>   28:	00 00 20 39 	li      r9,0
>   2c:	10 00 01 e8 	ld      r0,16(r1)
>   30:	28 00 69 80 	lwz     r3,40(r9)
> 
> We set r9 to 0 then load r9+40. The problem is actually in
> ibmvtpm_get_data, it can return NULL but the rest of the driver
> never expects it.
> 
> Add a BUG_ON in ibmvtpm_get_data. We still need to identify the root
> cause but at least this makes it obvious what went wrong.
> 
> Cc: stable@...r.kernel.org
> Signed-off-by: Anton Blanchard <anton@...ba.org>
> ---
> 
> diff --git a/drivers/char/tpm/tpm_ibmvtpm.c
> b/drivers/char/tpm/tpm_ibmvtpm.c index af74c57..0d1eeba 100644
> --- a/drivers/char/tpm/tpm_ibmvtpm.c
> +++ b/drivers/char/tpm/tpm_ibmvtpm.c
> @@ -63,9 +63,9 @@ static int ibmvtpm_send_crq(struct vio_dev *vdev, u64 w1,
> u64 w2) static struct ibmvtpm_dev *ibmvtpm_get_data(const struct device
> *dev) {
>  	struct tpm_chip *chip = dev_get_drvdata(dev);
> -	if (chip)
> -		return (struct ibmvtpm_dev *)TPM_VPRIV(chip);
> -	return NULL;
> +
> +	BUG_ON(!chip);
> +	return (struct ibmvtpm_dev *)TPM_VPRIV(chip);
>  }
> 
>  /**

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