linux-kernel - Re: [PATCH] optee: fix kfree NULL pointer

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Date:   Mon, 8 Nov 2021 11:03:53 +0530
From:   Sumit Garg <sumit.garg@...aro.org>
To:     cgel.zte@...il.com
Cc:     jens.wiklander@...aro.org, op-tee@...ts.trustedfirmware.org,
        linux-kernel@...r.kernel.org, Lv Ruyi <lv.ruyi@....com.cn>,
        Zeal Robot <zealci@....com.cn>
Subject: Re: [PATCH] optee: fix kfree NULL pointer

On Thu, 4 Nov 2021 at 17:00, <cgel.zte@...il.com> wrote:
>
> From: Lv Ruyi <lv.ruyi@....com.cn>
>
> This patch fixes the following Coccinelle error:
> drivers/tee/optee/ffa_abi.c: 877: ERROR  optee is NULL but dereferenced.
>
> If memory allocation fails, optee is null pointer. the code will goto err
>  and release optee.
>
> Reported-by: Zeal Robot <zealci@....com.cn>
> Signed-off-by: Lv Ruyi <lv.ruyi@....com.cn>
> ---
>  drivers/tee/optee/ffa_abi.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/drivers/tee/optee/ffa_abi.c b/drivers/tee/optee/ffa_abi.c
> index 6defd1ec982a..8d9d189557f9 100644
> --- a/drivers/tee/optee/ffa_abi.c
> +++ b/drivers/tee/optee/ffa_abi.c
> @@ -811,8 +811,7 @@ static int optee_ffa_probe(struct ffa_device *ffa_dev)
>
>         optee = kzalloc(sizeof(*optee), GFP_KERNEL);
>         if (!optee) {
> -               rc = -ENOMEM;
> -               goto err;
> +               return -ENOMEM;
>         }

So the braces are redundant after this change, hence can be dropped.

With that addressed:

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

-Sumit

>         optee->pool = optee_ffa_config_dyn_shm();
>         if (IS_ERR(optee->pool)) {
> --
> 2.25.1
>