linux-kernel - Re: [PATCH] ACPI: APEI: Fix num

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Date:   Wed, 5 Oct 2022 16:28:40 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Ashish Kalra <Ashish.Kalra@....com>
Cc:     rafael@...nel.org, lenb@...nel.org, james.morse@....com,
        tony.luck@...el.com, bp@...en8.de, robert.moore@...el.com,
        linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
        devel@...ica.org
Subject: Re: [PATCH] ACPI: APEI: Fix num_ghes to unsigned int

On Wed, Oct 5, 2022 at 1:06 AM Ashish Kalra <Ashish.Kalra@....com> wrote:
>
> From: Ashish Kalra <ashish.kalra@....com>
>
> Change num_ghes from int to unsigned int, preventing an overflow
> and causing subsequent vmalloc to fail.

So do you have a system where int is not sufficient?

> Signed-off-by: Ashish Kalra <ashish.kalra@....com>
> ---
>  drivers/acpi/apei/ghes.c | 2 +-
>  include/acpi/ghes.h      | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
> index d91ad378c00d..6d7c202142a6 100644
> --- a/drivers/acpi/apei/ghes.c
> +++ b/drivers/acpi/apei/ghes.c
> @@ -163,7 +163,7 @@ static void ghes_unmap(void __iomem *vaddr, enum fixed_addresses fixmap_idx)
>         clear_fixmap(fixmap_idx);
>  }
>
> -int ghes_estatus_pool_init(int num_ghes)
> +int ghes_estatus_pool_init(unsigned int num_ghes)
>  {
>         unsigned long addr, len;
>         int rc;
> diff --git a/include/acpi/ghes.h b/include/acpi/ghes.h
> index 34fb3431a8f3..292a5c40bd0c 100644
> --- a/include/acpi/ghes.h
> +++ b/include/acpi/ghes.h
> @@ -71,7 +71,7 @@ int ghes_register_vendor_record_notifier(struct notifier_block *nb);
>  void ghes_unregister_vendor_record_notifier(struct notifier_block *nb);
>  #endif
>
> -int ghes_estatus_pool_init(int num_ghes);
> +int ghes_estatus_pool_init(unsigned int num_ghes);
>
>  /* From drivers/edac/ghes_edac.c */
>
> --
> 2.25.1
>