linux-kernel - Re: [PATCH v2 1/7] efi/capsule: Fix return code on failing kmap/vmap

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Date:   Fri, 24 Mar 2017 18:14:31 +0000
From:   Ard Biesheuvel <ard.biesheuvel@...aro.org>
To:     Jan Kiszka <jan.kiszka@...mens.com>
Cc:     Matt Fleming <matt@...eblueprint.co.uk>,
        "linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        "Bryan O'Donoghue" <pure.logic@...us-software.ie>,
        Hock Leong Kweh <hock.leong.kweh@...el.com>,
        Borislav Petkov <bp@...en8.de>,
        Sascha Weisenberger <sascha.weisenberger@...mens.com>
Subject: Re: [PATCH v2 1/7] efi/capsule: Fix return code on failing kmap/vmap

On 24 March 2017 at 17:34, Jan Kiszka <jan.kiszka@...mens.com> wrote:
> If kmap or vmap fail, it means we ran out of memory. There are no
> user-provided addressed involved that would justify EFAULT.
>
> Signed-off-by: Jan Kiszka <jan.kiszka@...mens.com>

Reviewed-by: Ard Biesheuvel <ard.biesheuvel@...aro.org>

> ---
>  drivers/firmware/efi/capsule-loader.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/firmware/efi/capsule-loader.c b/drivers/firmware/efi/capsule-loader.c
> index 9ae6c11..91e91f7 100644
> --- a/drivers/firmware/efi/capsule-loader.c
> +++ b/drivers/firmware/efi/capsule-loader.c
> @@ -113,7 +113,7 @@ static ssize_t efi_capsule_submit_update(struct capsule_info *cap_info)
>                         VM_MAP, PAGE_KERNEL);
>         if (!cap_hdr_temp) {
>                 pr_debug("%s: vmap() failed\n", __func__);
> -               return -EFAULT;
> +               return -ENOMEM;
>         }
>
>         ret = efi_capsule_update(cap_hdr_temp, cap_info->pages);
> @@ -185,7 +185,7 @@ static ssize_t efi_capsule_write(struct file *file, const char __user *buff,
>         kbuff = kmap(page);
>         if (!kbuff) {
>                 pr_debug("%s: kmap() failed\n", __func__);
> -               ret = -EFAULT;
> +               ret = -ENOMEM;
>                 goto failed;
>         }
>         kbuff += PAGE_SIZE - cap_info->page_bytes_remain;
> --
> 2.10.2
>