Patch "ARM: EXYNOS: Fix dereference of ERR_PTR returned by of_genpd_get_from_provider" has been added to the 4.0-stable tree

Patch "ARM: EXYNOS: Fix dereference of ERR_PTR returned by of_genpd_get_from_provider" has been added to the 4.0-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    ARM: EXYNOS: Fix dereference of ERR_PTR returned by of_genpd_get_from_provider

to the 4.0-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     arm-exynos-fix-dereference-of-err_ptr-returned-by-of_genpd_get_from_provider.patch
and it can be found in the queue-4.0 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 0b7dc0ff95237a53287e52f1aab7408ebf1c4085 Mon Sep 17 00:00:00 2001
From: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Date: Wed, 13 May 2015 17:45:52 +0900
Subject: ARM: EXYNOS: Fix dereference of ERR_PTR returned by of_genpd_get_from_provider

From: Krzysztof Kozlowski <k.kozlowski@samsung.com>

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 <k.kozlowski@samsung.com>
Signed-off-by: Kukjin Kim <kgene@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/arm/mach-exynos/pm_domains.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- 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))


Patches currently in stable-queue which might be from k.kozlowski@samsung.com are

queue-4.0/arm-exynos-fix-dereference-of-err_ptr-returned-by-of_genpd_get_from_provider.patch
queue-4.0/arm-dts-set-display-clock-correctly-for-exynos4412-trats2.patch