linux-kernel - Re: [PATCH v4] tpm: Managed allocations for tpm

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Message-ID: <20250702125725.GA904431@ziepe.ca>
Date: Wed, 2 Jul 2025 09:57:25 -0300
From: Jason Gunthorpe <jgg@...pe.ca>
To: Jarkko Sakkinen <jarkko@...nel.org>
Cc: linux-kernel@...r.kernel.org, keyrings@...r.kernel.org,
	Stefan Berger <stefanb@...ux.ibm.com>,
	Jarkko Sakkinen <jarkko.sakkinen@...nsys.com>,
	Peter Huewe <peterhuewe@....de>,
	James Bottomley <James.Bottomley@...senpartnership.com>,
	Mimi Zohar <zohar@...ux.ibm.com>,
	David Howells <dhowells@...hat.com>,
	Paul Moore <paul@...l-moore.com>, James Morris <jmorris@...ei.org>,
	"Serge E. Hallyn" <serge@...lyn.com>,
	"open list:TPM DEVICE DRIVER" <linux-integrity@...r.kernel.org>,
	"open list:SECURITY SUBSYSTEM" <linux-security-module@...r.kernel.org>
Subject: Re: [PATCH v4] tpm: Managed allocations for tpm_buf instances

On Tue, Jul 01, 2025 at 05:51:35PM +0300, Jarkko Sakkinen wrote:
> @@ -32,28 +32,30 @@ struct tpm_readpubek_out {
>  static ssize_t pubek_show(struct device *dev, struct device_attribute *attr,
>  			  char *buf)
>  {
> -	struct tpm_buf tpm_buf;
> +	struct tpm_buf *tpm_buf __free(kfree) = NULL;
>  	struct tpm_readpubek_out *out;
>  	int i;
>  	char *str = buf;
>  	struct tpm_chip *chip = to_tpm_chip(dev);
>  	char anti_replay[20];
>  
> +	tpm_buf = tpm_buf_alloc();
> +	if (!tpm_buf)
> +		return -ENOMEM;

apprently this isn't the style guide, you are supposed to write:

  	char anti_replay[20];

	struct tpm_buf *tpm_buf __free(kfree) =  tpm_buf_alloc();
	if (!tpm_buf)
		return -ENOMEM;

Jason