Re: [PATCH] asus-laptop: Fix an uninitialized variable

[Ilpo Järvinen]

On Tue, 25 Mar 2025, Denis Arefev wrote:

> The value returned by the acpi_evaluate_integer() function is not
> checked, but the result is not always successful, so an uninitialized
> 'val' variable may be used in calculations.
> 
> Found by Linux Verification Center (linuxtesting.org) with SVACE.
> 
> Fixes: b23910c2194e ("asus-laptop: Pegatron Lucid accelerometer")
> Cc: stable@xxxxxxxxxxxxxxx 
> Signed-off-by: Denis Arefev <arefev@xxxxxxxxx>
> ---
>  drivers/platform/x86/asus-laptop.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/platform/x86/asus-laptop.c b/drivers/platform/x86/asus-laptop.c
> index d460dd194f19..b74b7d0eb6c2 100644
> --- a/drivers/platform/x86/asus-laptop.c
> +++ b/drivers/platform/x86/asus-laptop.c
> @@ -427,7 +427,7 @@ static int asus_pega_lucid_set(struct asus_laptop *asus, int unit, bool enable)
>  static int pega_acc_axis(struct asus_laptop *asus, int curr, char *method)
>  {
>  	int i, delta;
> -	unsigned long long val;
> +	unsigned long long val = PEGA_ACC_CLAMP;
>  	for (i = 0; i < PEGA_ACC_RETRIES; i++) {
>  		acpi_evaluate_integer(asus->handle, method, NULL, &val);

Shouldn't you handle the error from acpi_evaluate_integer() properly 
instead?

-- 
 i.