linux-kernel - Re: [PATCH] PM / Domains: check for negative return from of_count_phandle_with

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Date:   Tue, 25 Oct 2016 11:14:40 -0700
From:   Kevin Hilman <khilman@...libre.com>
To:     Colin King <colin.king@...onical.com>
Cc:     "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Pavel Machek <pavel@....cz>, Len Brown <len.brown@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PM / Domains: check for negative return from of_count_phandle_with_args

Colin King <colin.king@...onical.com> writes:

> From: Colin Ian King <colin.king@...onical.com>
>
> The return from of_count_phandle_with_args can be negative, so we
> should avoid kcalloc of a negative count of genpd_power_stat structs
> by sanity checking if count is zero or less.
>
> Signed-off-by: Colin Ian King <colin.king@...onical.com>

Acked-by: Kevin Hilman <khilman@...libre.com>

> ---
>  drivers/base/power/domain.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
> index aac656a..661737c 100644
> --- a/drivers/base/power/domain.c
> +++ b/drivers/base/power/domain.c
> @@ -2113,7 +2113,7 @@ int of_genpd_parse_idle_states(struct device_node *dn,
>  	struct of_phandle_iterator it;
>  
>  	count = of_count_phandle_with_args(dn, "domain-idle-states", NULL);
> -	if (!count)
> +	if (count <= 0)
>  		return -EINVAL;
>  
>  	st = kcalloc(count, sizeof(*st), GFP_KERNEL);