linux-kernel - Re: [PATCH 2/2] ima: support calculating the boot

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Message-ID: <87e6b531-3596-4523-a6b0-629ae8fd6995@linux.microsoft.com>
Date:   Mon, 27 Jan 2020 08:50:31 -0800
From:   Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>
To:     Mimi Zohar <zohar@...ux.ibm.com>, linux-integrity@...r.kernel.org
Cc:     Jerry Snitselaar <jsnitsel@...hat.com>,
        James Bottomley <James.Bottomley@...senPartnership.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] ima: support calculating the boot_aggregate based on
 different TPM banks

On 1/27/2020 8:01 AM, Mimi Zohar wrote:

> +
> +	for (i = 0; i < ima_tpm_chip->nr_allocated_banks; i++) {
> +		if (ima_tpm_chip->allocated_banks[i].alg_id == d.alg_id)
> +			break;
> +	}
> +
> +	if (i == ima_tpm_chip->nr_allocated_banks)
> +		d.alg_id = ima_tpm_chip->allocated_banks[0].alg_id;
> +

Can the number of allocated banks (ima_tpm_chip->nr_allocated_banks) be 
zero? Should that be checked before accessing "allocated_banks"?

  -lakshmi