linux-kernel - Re: [PATCH v2] Staging: exfat: Avoid use of strcpy

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Date:   Wed, 11 Sep 2019 13:06:16 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Sandro Volery <sandro@...ery.com>
Cc:     valdis.kletnieks@...edu, gregkh@...uxfoundation.org,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        linux@...musvillemoes.dk
Subject: Re: [PATCH v2] Staging: exfat: Avoid use of strcpy

On Wed, Sep 11, 2019 at 11:42:19AM +0200, Sandro Volery wrote:
> Use strscpy instead of strcpy in exfat_core.c, and add a check
> for length that will return already known FFS_INVALIDPATH.
> 
> Suggested-by: Rasmus Villemoes <linux@...musvillemoes.dk>
> Signed-off-by: Sandro Volery <sandro@...ery.com>
> ---
> v2: Implement length check and return in one
> v1: Original Patch
>  drivers/staging/exfat/exfat_core.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/exfat/exfat_core.c b/drivers/staging/exfat/exfat_core.c
> index da8c58149c35..4c40f1352848 100644
> --- a/drivers/staging/exfat/exfat_core.c
> +++ b/drivers/staging/exfat/exfat_core.c
> @@ -2964,7 +2964,8 @@ s32 resolve_path(struct inode *inode, char *path, struct chain_t *p_dir,
>  	if (strlen(path) >= (MAX_NAME_LENGTH * MAX_CHARSET_SIZE))
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Delete this as it is no longer required.

>  		return FFS_INVALIDPATH;
>  
> -	strcpy(name_buf, path);
> +	if (strscpy(name_buf, path, sizeof(name_buf)) < 0)
> +		return FFS_INVALIDPATH;

regards,
dan carpenter