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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com>,
	Barry Song <song.bao.hua@hisilicon.com>,
	Hanjun Guo <guohanjun@huawei.com>,
	"Rafael J . Wysocki" <rafael.j.wysocki@intel.com>,
	Sasha Levin <sashal@kernel.org>,
	linux-acpi@vger.kernel.org
Subject: [PATCH AUTOSEL 5.9 086/147] ACPI: Add out of bounds and numa_off protections to pxm_to_node()
Date: Mon, 26 Oct 2020 19:48:04 -0400
Message-ID: <20201026234905.1022767-86-sashal@kernel.org> (raw)
In-Reply-To: <20201026234905.1022767-1-sashal@kernel.org>

From: Jonathan Cameron <Jonathan.Cameron@huawei.com>

[ Upstream commit 8a3decac087aa897df5af04358c2089e52e70ac4 ]

The function should check the validity of the pxm value before using
it to index the pxm_to_node_map[] array.

Whilst hardening this code may be good in general, the main intent
here is to enable following patches that use this function to replace
acpi_map_pxm_to_node() for non SRAT usecases which should return
NO_NUMA_NODE for PXM entries not matching with those in SRAT.

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Barry Song <song.bao.hua@hisilicon.com>
Reviewed-by: Hanjun Guo <guohanjun@huawei.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/acpi/numa/srat.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/acpi/numa/srat.c b/drivers/acpi/numa/srat.c
index 15bbaab8500b9..1fb486f46ee20 100644
--- a/drivers/acpi/numa/srat.c
+++ b/drivers/acpi/numa/srat.c
@@ -31,7 +31,7 @@ int acpi_numa __initdata;
 
 int pxm_to_node(int pxm)
 {
-	if (pxm < 0)
+	if (pxm < 0 || pxm >= MAX_PXM_DOMAINS || numa_off)
 		return NUMA_NO_NODE;
 	return pxm_to_node_map[pxm];
 }
-- 
2.25.1


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Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20201026234905.1022767-1-sashal@kernel.org>
2020-10-26 23:48 ` Sasha Levin [this message]
2020-10-26 23:48 ` [PATCH AUTOSEL 5.9 098/147] ACPI: HMAT: Fix handling of changes from ACPI 6.2 to ACPI 6.3 Sasha Levin
2020-10-26 23:48 ` [PATCH AUTOSEL 5.9 110/147] PCI/ACPI: Add Ampere Altra SOC MCFG quirk Sasha Levin

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