linux-kernel - Re: [PATCH 5/8] firmware: vpd: use kasprintf() when forming name of 'raw' attribute

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Date:   Wed, 24 May 2017 10:18:01 -0700
From:   Guenter Roeck <groeck@...gle.com>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Wei-Ning Huang <wnhuang@...gle.com>,
        Julius Werner <jwerner@...omium.org>,
        Guenter Roeck <groeck@...omium.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 5/8] firmware: vpd: use kasprintf() when forming name of
 'raw' attribute

On Tue, May 23, 2017 at 5:07 PM, Dmitry Torokhov
<dmitry.torokhov@...il.com> wrote:
> When creating name for the "raw" attribute, let's switch to using
> kaspeintf() instead of doing it by hand. Also make sure we handle
> errors.
>
> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>

Reviewed-by: Guenter Roeck <groeck@...omium.org>

> ---
>  drivers/firmware/google/vpd.c | 31 +++++++++++++++----------------
>  1 file changed, 15 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/firmware/google/vpd.c b/drivers/firmware/google/vpd.c
> index cb07a2984ece..3463b8037ed8 100644
> --- a/drivers/firmware/google/vpd.c
> +++ b/drivers/firmware/google/vpd.c
> @@ -190,8 +190,7 @@ static int vpd_section_create_attribs(struct vpd_section *sec)
>  static int vpd_section_init(const char *name, struct vpd_section *sec,
>                             phys_addr_t physaddr, size_t size)
>  {
> -       int ret;
> -       int raw_len;
> +       int err;
>
>         sec->baseaddr = memremap(physaddr, size, MEMREMAP_WB);
>         if (!sec->baseaddr)
> @@ -200,10 +199,11 @@ static int vpd_section_init(const char *name, struct vpd_section *sec,
>         sec->name = name;
>
>         /* We want to export the raw partion with name ${name}_raw */
> -       raw_len = strlen(name) + 5;
> -       sec->raw_name = kzalloc(raw_len, GFP_KERNEL);
> -       strncpy(sec->raw_name, name, raw_len);
> -       strncat(sec->raw_name, "_raw", raw_len);
> +       sec->raw_name = kasprintf(GFP_KERNEL, "%s_raw", name);
> +       if (!sec->raw_name) {
> +               err = -ENOMEM;
> +               goto err_iounmap;
> +       }
>
>         sysfs_bin_attr_init(&sec->bin_attr);
>         sec->bin_attr.attr.name = sec->raw_name;
> @@ -212,14 +212,14 @@ static int vpd_section_init(const char *name, struct vpd_section *sec,
>         sec->bin_attr.read = vpd_section_read;
>         sec->bin_attr.private = sec;
>
> -       ret = sysfs_create_bin_file(vpd_kobj, &sec->bin_attr);
> -       if (ret)
> -               goto free_sec;
> +       err = sysfs_create_bin_file(vpd_kobj, &sec->bin_attr);
> +       if (err)
> +               goto err_free_raw_name;
>
>         sec->kobj = kobject_create_and_add(name, vpd_kobj);
>         if (!sec->kobj) {
> -               ret = -EINVAL;
> -               goto sysfs_remove;
> +               err = -EINVAL;
> +               goto err_sysfs_remove;
>         }
>
>         INIT_LIST_HEAD(&sec->attribs);
> @@ -229,14 +229,13 @@ static int vpd_section_init(const char *name, struct vpd_section *sec,
>
>         return 0;
>
> -sysfs_remove:
> +err_sysfs_remove:
>         sysfs_remove_bin_file(vpd_kobj, &sec->bin_attr);
> -
> -free_sec:
> +err_free_raw_name:
>         kfree(sec->raw_name);
> +err_iounmap:
>         iounmap(sec->baseaddr);
> -
> -       return ret;
> +       return err;
>  }
>
>  static int vpd_section_destroy(struct vpd_section *sec)
> --
> 2.13.0.219.gdb65acc882-goog
>