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

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Date:   Tue, 25 Oct 2016 17:33:27 +0100
From:   Colin King <colin.king@...onical.com>
To:     "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Kevin Hilman <khilman@...nel.org>,
        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
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH] PM / Domains: check for negative return from of_count_phandle_with_args

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>
---
 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);
-- 
2.9.3