linux-kernel - Re: [PATCH -next] tee: optee: Fix unsigned comparison with less than zero

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Message-ID: <CAFA6WYMg9BrownTELgE85AMO-_0VWBH0oJzfnBVXzN+LNNdDYA@mail.gmail.com>
Date:   Tue, 19 Feb 2019 14:16:53 +0530
From:   Sumit Garg <sumit.garg@...aro.org>
To:     YueHaibing <yuehaibing@...wei.com>
Cc:     Jens Wiklander <jens.wiklander@...aro.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -next] tee: optee: Fix unsigned comparison with less than zero

On Tue, 19 Feb 2019 at 12:34, YueHaibing <yuehaibing@...wei.com> wrote:
>
> The return from the call to tee_client_invoke_func can be a
> negative error code however this is being assigned to an
> unsigned variable 'ret' hence the check is always false.
> Fix this by making 'ret' an int.
>
> Detected by Coccinelle ("Unsigned expression compared with zero:
> ret < 0")
>
> Fixes: c3fa24af9244 ("tee: optee: add TEE bus device enumeration support")
> Signed-off-by: YueHaibing <yuehaibing@...wei.com>

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

> ---
>  drivers/tee/optee/device.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/tee/optee/device.c b/drivers/tee/optee/device.c
> index 5e4938b..1f22376 100644
> --- a/drivers/tee/optee/device.c
> +++ b/drivers/tee/optee/device.c
> @@ -34,7 +34,7 @@ static int optee_ctx_match(struct tee_ioctl_version_data *ver, const void *data)
>  static int get_devices(struct tee_context *ctx, u32 session,
>                        struct tee_shm *device_shm, u32 *shm_size)
>  {
> -       u32 ret = 0;
> +       int ret = 0;
>         struct tee_ioctl_invoke_arg inv_arg = {0};
>         struct tee_param param[4] = {0};
>
> --
> 2.7.0
>
>