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

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Date:	Tue, 2 Dec 2014 13:22:35 -0600 (CST)
From:	Ashley Lai <ashley@...leylai.com>
To:	Anton Blanchard <anton@...ba.org>
cc:	Peter Huewe <peterhuewe@....de>, 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

> @@ -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);

With the recent patch from Vicky, it is possible to have a NULL value for 
chip which will trigger a false positive for BUG_ON(!chip).

> +	return (struct ibmvtpm_dev *)TPM_VPRIV(chip);
> }
>
> /**
>
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