linux-kernel - Re: [PATCH v2] optee: add error checks in optee_ffa_do_call_with

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Date:   Thu, 20 Jan 2022 16:48:12 +0530
From:   Sumit Garg <sumit.garg@...aro.org>
To:     Jens Wiklander <jens.wiklander@...aro.org>
Cc:     linux-kernel@...r.kernel.org, op-tee@...ts.trustedfirmware.org,
        David Laight <David.Laight@...lab.com>
Subject: Re: [PATCH v2] optee: add error checks in optee_ffa_do_call_with_arg()

On Thu, 20 Jan 2022 at 13:12, Jens Wiklander <jens.wiklander@...aro.org> wrote:
>
> Adds error checking in optee_ffa_do_call_with_arg() for correctness.
>
> Fixes: 4615e5a34b95 ("optee: add FF-A support")
> Signed-off-by: Jens Wiklander <jens.wiklander@...aro.org>
> ---
>  drivers/tee/optee/ffa_abi.c | 15 ++++++++++++---
>  1 file changed, 12 insertions(+), 3 deletions(-)
>

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

-Sumit

> diff --git a/drivers/tee/optee/ffa_abi.c b/drivers/tee/optee/ffa_abi.c
> index 20a1b1a3d965..0775759a29c0 100644
> --- a/drivers/tee/optee/ffa_abi.c
> +++ b/drivers/tee/optee/ffa_abi.c
> @@ -619,9 +619,18 @@ static int optee_ffa_do_call_with_arg(struct tee_context *ctx,
>                 .data2 = (u32)(shm->sec_world_id >> 32),
>                 .data3 = shm->offset,
>         };
> -       struct optee_msg_arg *arg = tee_shm_get_va(shm, 0);
> -       unsigned int rpc_arg_offs = OPTEE_MSG_GET_ARG_SIZE(arg->num_params);
> -       struct optee_msg_arg *rpc_arg = tee_shm_get_va(shm, rpc_arg_offs);
> +       struct optee_msg_arg *arg;
> +       unsigned int rpc_arg_offs;
> +       struct optee_msg_arg *rpc_arg;
> +
> +       arg = tee_shm_get_va(shm, 0);
> +       if (IS_ERR(arg))
> +               return PTR_ERR(arg);
> +
> +       rpc_arg_offs = OPTEE_MSG_GET_ARG_SIZE(arg->num_params);
> +       rpc_arg = tee_shm_get_va(shm, rpc_arg_offs);
> +       if (IS_ERR(rpc_arg))
> +               return PTR_ERR(rpc_arg);
>
>         return optee_ffa_yielding_call(ctx, &data, rpc_arg);
>  }
> --
> 2.31.1
>