linux-kernel - Re: [PATCH][next] ACPI: scan: ensure ret is initialized to avoid garbage being returned

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Message-ID: <CAFLoDVE03-Eqmrji66P-b79ezgD0PayWqO5u3L7nyjMX1+LBtg@mail.gmail.com>
Date:   Wed, 9 Jun 2021 22:38:04 +0100
From:   Daniel Scally <djrscally@...il.com>
To:     Colin King <colin.king@...onical.com>
Cc:     "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        Maximilian Luz <luzmaximilian@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        kernel-janitors@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH][next] ACPI: scan: ensure ret is initialized to avoid
 garbage being returned

Hi Colin

On Wed, Jun 9, 2021 at 6:33 PM Colin King <colin.king@...onical.com> wrote:
>
> From: Colin Ian King <colin.king@...onical.com>
>
> In the unlikely event that there are no callback calls made then ret
> will be returned as an uninitialized value. Clean up static analysis
> warnings by ensuring ret is initialized.

Ah, thanks - good spot.

> Addresses-Coverity: ("Uninitialized scalar variable")
> Fixes: a9e10e587304 ("ACPI: scan: Extend acpi_walk_dep_device_list()")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>

Reviewed-by: Daniel Scally <djrscally@...il.com>

I'm still bad at Git; will the commit hash here be right, since the
patch that this fixes isn't upstream yet?

(hope the gmail web client doesn't maul this too badly...)
> ---
>  drivers/acpi/scan.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
> index c3067e8bfc47..0945d952f0fc 100644
> --- a/drivers/acpi/scan.c
> +++ b/drivers/acpi/scan.c
> @@ -2151,7 +2151,7 @@ int acpi_walk_dep_device_list(acpi_handle handle,
>                               void *data)
>  {
>         struct acpi_dep_data *dep, *tmp;
> -       int ret;
> +       int ret = 0;
>
>         mutex_lock(&acpi_dep_list_lock);
>         list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) {
> --
> 2.31.1
>