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Subject[PATCH] PM / Domains: check for negative return from of_count_phandle_with_args
Date
From: Colin Ian King <colin.king@canonical.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@canonical.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
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