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

Daniel Scally
2021-06-09T22:39:30Z

Hi Colin

On Wed, Jun 9, 2021 at 6:33 PM Colin King <colin.king@canonical.com> wrote:
>
> From: Colin Ian King <colin.king@canonical.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@canonical.com>

Reviewed-by: Daniel Scally <djrscally@gmail.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
>