linux-kernel - Re: [PATCH] efi: cper: check section header more appropriately

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Message-ID: <CAMj1kXEY=kK9+LfJtemBZND_u-+nP7qu6cNJxxLfQJ6CV1Ub8Q@mail.gmail.com>
Date:   Fri, 27 Aug 2021 16:04:28 +0200
From:   Ard Biesheuvel <ardb@...nel.org>
To:     Shuai Xue <xueshuai@...ux.alibaba.com>
Cc:     linux-efi <linux-efi@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        zhangliguang@...ux.alibaba.com
Subject: Re: [PATCH] efi: cper: check section header more appropriately

On Mon, 23 Aug 2021 at 13:57, Shuai Xue <xueshuai@...ux.alibaba.com> wrote:
>
> When checking a generic status block, we iterate over all the generic data
> blocks. The loop condition checks that the generic data block is valid.
> Because the size of data blocks (excluding error data) may vary depending
> on the revision and the revision is contained within the data block, we
> should ensure that enough of the current data block is valid appropiriately
> for different revision.
>
> Signed-off-by: Shuai Xue <xueshuai@...ux.alibaba.com>

Applied, thanks.

> ---
>  drivers/firmware/efi/cper.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/firmware/efi/cper.c b/drivers/firmware/efi/cper.c
> index e15d484b6a5a..e80706d9e78a 100644
> --- a/drivers/firmware/efi/cper.c
> +++ b/drivers/firmware/efi/cper.c
> @@ -635,7 +635,7 @@ int cper_estatus_check(const struct acpi_hest_generic_status *estatus)
>         data_len = estatus->data_length;
>
>         apei_estatus_for_each_section(estatus, gdata) {
> -               if (sizeof(struct acpi_hest_generic_data) > data_len)
> +               if (acpi_hest_get_size(gdata) > data_len)
>                         return -EINVAL;
>
>                 record_size = acpi_hest_get_record_size(gdata);
> --
> 2.20.1.12.g72788fdb
>