linux-kernel - Re: [PATCH] tee: optee: fix device enumeration error handling

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Date:   Thu, 7 Nov 2019 10:41:46 +0530
From:   Sumit Garg <sumit.garg@...aro.org>
To:     Jens Wiklander <jens.wiklander@...aro.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        "tee-dev @ lists . linaro . org" <tee-dev@...ts.linaro.org>,
        Victor Chong <victor.chong@...aro.org>,
        Jerome Forissier <jerome@...issier.org>,
        Etienne Carriere <etienne.carriere@...aro.org>
Subject: Re: [PATCH] tee: optee: fix device enumeration error handling

On Wed, 6 Nov 2019 at 21:25, Jens Wiklander <jens.wiklander@...aro.org> wrote:
>
> Prior to this patch in optee_probe() when optee_enumerate_devices() was
> called the struct optee was fully initialized. If
> optee_enumerate_devices() returns an error optee_probe() is supposed to
> clean up and free the struct optee completely, but will at this late
> stage need to call optee_remove() instead. This isn't done and thus
> freeing the struct optee prematurely.
>
> With this patch the call to optee_enumerate_devices() is done after
> optee_probe() has returned successfully and in case
> optee_enumerate_devices() fails everything is cleaned up with a call to
> optee_remove().
>
> Fixes: c3fa24af9244 ("tee: optee: add TEE bus device enumeration support")
> Signed-off-by: Jens Wiklander <jens.wiklander@...aro.org>
> ---
>  drivers/tee/optee/core.c | 20 ++++++++++++--------
>  1 file changed, 12 insertions(+), 8 deletions(-)
>

Reviewed-by: Sumit Garg <sumit.garg@...aro.org>

> diff --git a/drivers/tee/optee/core.c b/drivers/tee/optee/core.c
> index 1854a3db7345..b830e0a87fba 100644
> --- a/drivers/tee/optee/core.c
> +++ b/drivers/tee/optee/core.c
> @@ -643,11 +643,6 @@ static struct optee *optee_probe(struct device_node *np)
>         if (optee->sec_caps & OPTEE_SMC_SEC_CAP_DYNAMIC_SHM)
>                 pr_info("dynamic shared memory is enabled\n");
>
> -       rc = optee_enumerate_devices();
> -       if (rc)
> -               goto err;
> -
> -       pr_info("initialized driver\n");
>         return optee;
>  err:
>         if (optee) {
> @@ -702,9 +697,10 @@ static struct optee *optee_svc;
>
>  static int __init optee_driver_init(void)
>  {
> -       struct device_node *fw_np;
> -       struct device_node *np;
> -       struct optee *optee;
> +       struct device_node *fw_np = NULL;
> +       struct device_node *np = NULL;
> +       struct optee *optee = NULL;
> +       int rc = 0;
>
>         /* Node is supposed to be below /firmware */
>         fw_np = of_find_node_by_name(NULL, "firmware");
> @@ -723,6 +719,14 @@ static int __init optee_driver_init(void)
>         if (IS_ERR(optee))
>                 return PTR_ERR(optee);
>
> +       rc = optee_enumerate_devices();
> +       if (rc) {
> +               optee_remove(optee);
> +               return rc;
> +       }
> +
> +       pr_info("initialized driver\n");
> +
>         optee_svc = optee;
>
>         return 0;
> --
> 2.17.1
>