From: Krzysztof Kozlowski Date: Wed, 13 May 2015 08:45:52 +0000 (+0900) Subject: ARM: EXYNOS: Fix dereference of ERR_PTR returned by of_genpd_get_from_provider X-Git-Tag: v4.0.5~45 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=653a1273c800cf291f3aba73338c47a1792f3015;p=thirdparty%2Fkernel%2Fstable.git ARM: EXYNOS: Fix dereference of ERR_PTR returned by of_genpd_get_from_provider commit 0b7dc0ff95237a53287e52f1aab7408ebf1c4085 upstream. 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") Signed-off-by: Krzysztof Kozlowski Signed-off-by: Kukjin Kim Signed-off-by: Greg Kroah-Hartman --- diff --git a/arch/arm/mach-exynos/pm_domains.c b/arch/arm/mach-exynos/pm_domains.c index 37266a8264372..1f02bcb350e59 100644 --- a/arch/arm/mach-exynos/pm_domains.c +++ b/arch/arm/mach-exynos/pm_domains.c @@ -169,7 +169,7 @@ 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", @@ -177,7 +177,7 @@ 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))