linux-kernel - [PATCH 3.16 106/204] iommu/exynos: Remove initconst attribute to avoid potential kernel oops

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Message-ID: <lsq.1514480744.777018966@decadent.org.uk>
Date:   Thu, 28 Dec 2017 17:05:44 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Marek Szyprowski" <m.szyprowski@...sung.com>,
        "Joerg Roedel" <jroedel@...e.de>,
        "Krzysztof Kozlowski" <krzk@...nel.org>
Subject: [PATCH 3.16 106/204] iommu/exynos: Remove initconst attribute to
 avoid potential kernel oops

3.16.52-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Marek Szyprowski <m.szyprowski@...sung.com>

commit 9d25e3cc83d731ae4eeb017fd07562fde3f80bef upstream.

Exynos SYSMMU registers standard platform device with sysmmu_of_match
table, what means that this table is accessed every time a new platform
device is registered in a system. This might happen also after the boot,
so the table must not be attributed as initconst to avoid potential kernel
oops caused by access to freed memory.

Fixes: 6b21a5db3642 ("iommu/exynos: Support for device tree")
Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>
Reviewed-by: Krzysztof Kozlowski <krzk@...nel.org>
Signed-off-by: Joerg Roedel <jroedel@...e.de>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/iommu/exynos-iommu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/iommu/exynos-iommu.c
+++ b/drivers/iommu/exynos-iommu.c
@@ -676,7 +676,7 @@ static int __init exynos_sysmmu_probe(st
 	return 0;
 }
 
-static const struct of_device_id sysmmu_of_match[] __initconst = {
+static const struct of_device_id sysmmu_of_match[] = {
 	{ .compatible	= "samsung,exynos-sysmmu", },
 	{ },
 };