linux-kernel - Re: [PATCH] coda: return -EFAULT if copy fails

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Message-ID: <5359488e-2b37-b328-3dbc-00bedd1726d5@wanadoo.fr>
Date:   Mon, 15 May 2023 19:15:54 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Su Hui <suhui@...china.com>, Jan Harkes <jaharkes@...cmu.edu>,
        coda@...cmu.edu
Cc:     codalist@...a.cs.cmu.edu, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] coda: return -EFAULT if copy fails

Le 15/05/2023 à 08:19, Su Hui a écrit :
> The copy_to/from_user() functions should return -EFAULT instead of -EINVAL.

Hi,

just for my understanding, why?

Even if not perfect:
    git grep -A1 copy_from_user | grep EINV | wc -l
    15

    git grep -A1 copy_to_user | grep EINV | wc -l
    12

CJ

> 
> Signed-off-by: Su Hui <suhui@...china.com>
> ---
>   fs/coda/upcall.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/coda/upcall.c b/fs/coda/upcall.c
> index cd6a3721f6f6..1517dc3bd592 100644
> --- a/fs/coda/upcall.c
> +++ b/fs/coda/upcall.c
> @@ -510,7 +510,7 @@ int venus_pioctl(struct super_block *sb, struct CodaFid *fid,
>           /* get the data out of user space */
>   	if (copy_from_user((char *)inp + (long)inp->coda_ioctl.data,
>   			   data->vi.in, data->vi.in_size)) {
> -		error = -EINVAL;
> +		error = -EFAULT;
>   	        goto exit;
>   	}
>