linux-kernel - Re: [PATCH] ARM: EXYNOS: Fix dereference of ERR_PTR returned byof_genpd_get_from

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Message-ID: <CAJKOXPczZJEauicZRgstkufuj5s8pkrXbiDQoAkRp1mx79TNPw@mail.gmail.com>
Date:	Wed, 13 May 2015 19:01:45 +0900
From:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
To:	Kukjin Kim <kgene@...nel.org>
Cc:	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	linux-samsung-soc@...r.kernel.org, stable@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] ARM: EXYNOS: Fix dereference of ERR_PTR returned byof_genpd_get_from_provider

2015-05-13 17:44 GMT+09:00 Kukjin Kim <kgene@...nel.org>:
> On 05/13/15 12:17, Krzysztof Kozlowski wrote:
>> 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.
>>
>> Signed-off-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
>> Cc: <stable@...r.kernel.org>
>
> Maybe [4.0+]? but as you mentioned this patch has a dependency with

Tag fixes with commit ID is sufficient for stable backporting.

> Patch "ARM: EXYNOS: Add missing of_node_put() when parsing power domain"
> and it means this cannot be applied into stable tree...
>
> So I'll apply this patch firstly then please re-submit them I've missed
> before based on samsung tree. I think, it would be better...
>
>> Fixes: 0f7807518fe1 ("ARM: EXYNOS: add support for sub-power domains")

I will get an notification when this patch won't apply to stable tree
(like v4.0) because of conflicts. Then usually I fix/rebase the patch
and send to the stable tree. So don't worry about this, I will handle
the backport.

Best regards,
Krzysztof
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