[PATCH] PM / Domains: check for negative return from of_count_phandle_with_args

[Colin King]

From: Colin Ian King <colin.king@xxxxxxxxxxxxx>

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@xxxxxxxxxxxxx>
---
 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