linux-kernel - Re: [PATCH] tpm_crb: Fix an error handling path in crb_acpi

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Date:   Sun, 20 Aug 2023 08:21:47 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Peter Huewe <peterhuewe@....de>,
        Jarkko Sakkinen <jarkko@...nel.org>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Matthew Garrett <mjg59@...f.ucam.org>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        linux-integrity@...r.kernel.org
Subject: Re: [PATCH] tpm_crb: Fix an error handling path in crb_acpi_add()

Le 25/02/2023 à 11:58, Christophe JAILLET a écrit :
> Some error paths don't call acpi_put_table() before returning.
> Branch to the correct place instead of doing some direct return.
> 
> Fixes: 4d2732882703 ("tpm_crb: Add support for CRB devices based on Pluton")
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> ---
>   drivers/char/tpm/tpm_crb.c | 5 +++--
>   1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/char/tpm/tpm_crb.c b/drivers/char/tpm/tpm_crb.c
> index 99698ee1a744..f7068bd8b3d0 100644
> --- a/drivers/char/tpm/tpm_crb.c
> +++ b/drivers/char/tpm/tpm_crb.c
> @@ -771,12 +771,13 @@ static int crb_acpi_add(struct acpi_device *device)
>   				FW_BUG "TPM2 ACPI table has wrong size %u for start method type %d\n",
>   				buf->header.length,
>   				ACPI_TPM2_COMMAND_BUFFER_WITH_PLUTON);
> -			return -EINVAL;
> +			rc = -EINVAL;
> +			goto out;
>   		}
>   		crb_pluton = ACPI_ADD_PTR(struct tpm2_crb_pluton, buf, sizeof(*buf));
>   		rc = crb_map_pluton(dev, priv, buf, crb_pluton);
>   		if (rc)
> -			return rc;
> +			goto out;
>   	}
>   
>   	priv->sm = sm;

Hi,

polite reminder.

While re-looking at it, the 3rd parameter of crb_map_pluton() (i.e. buf) 
looks unused and could be removed if it makes sense to you.

CJ