[PATCH 2/2] PM / Domains: Fix potential NULL pointer dereference

[Jon Hunter <jonathanh-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>]

In the function of_genpd_get_from_provider(), we never check to see if
the argument 'genpdspec' is NULL before dereferencing it. Add error
checking to handle any NULL pointers.

Signed-off-by: Jon Hunter <jonathanh-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
---
 drivers/base/power/domain.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index ea9f2aa3fc33..5bdb42bf40f4 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -1686,6 +1686,9 @@ struct generic_pm_domain *of_genpd_get_from_provider(
 	struct generic_pm_domain *genpd = ERR_PTR(-ENOENT);
 	struct of_genpd_provider *provider;
 
+	if (!genpdspec)
+		return ERR_PTR(-EINVAL);
+
 	mutex_lock(&of_genpd_mutex);
 
 	/* Check if we have such a provider in our array */
-- 
2.1.4