ARM: EXYNOS: Fix dereference of ERR_PTR returned by of_genpd_get_from_provider

ERR_PTR was dereferenced during sub domain parsing, if parent domain
could not be obtained (because of invalid phandle or deferred
registration of parent domain).

The Exynos power domain code checked whether
of_genpd_get_from_provider() returned NULL and in that case it skipped
that power domain node. However this function returns ERR_PTR or valid
pointer, not NULL.

Fixes: 0f7807518fe1 ("ARM: EXYNOS: add support for sub-power domains")
Cc: <stable@vger.kernel.org>	[4.0+]
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Kukjin Kim <kgene@kernel.org>

diff --git a/arch/arm/mach-exynos/pm_domains.c b/arch/arm/mach-exynos/pm_domains.c
index cbe56b35aea000fe2ad5841851b5eb9a57a307d5..a9686535f9ed460706a41a99dc60d6d4f575ab3b 100644 (file)
--- a/arch/arm/mach-exynos/pm_domains.c
+++ b/arch/arm/mach-exynos/pm_domains.c
@@ -188,7 +188,7 @@ no_clk:
                args.np = np;
                args.args_count = 0;
                child_domain = of_genpd_get_from_provider(&args);
-               if (!child_domain)
+               if (IS_ERR(child_domain))
                        continue;
 
                if (of_parse_phandle_with_args(np, "power-domains",
@@ -196,7 +196,7 @@ no_clk:
                        continue;
 
                parent_domain = of_genpd_get_from_provider(&args);
-               if (!parent_domain)
+               if (IS_ERR(parent_domain))
                        continue;
 
                if (pm_genpd_add_subdomain(parent_domain, child_domain))