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Date: Tue, 3 Nov 2020 21:32:57 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Jonathan Cameron <Jonathan.Cameron@...wei.com>, Barry Song <song.bao.hua@...ilicon.com>, Hanjun Guo <guohanjun@...wei.com>, "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>, Sasha Levin <sashal@...nel.org> Subject: [PATCH 5.9 126/391] ACPI: Add out of bounds and numa_off protections to pxm_to_node() From: Jonathan Cameron <Jonathan.Cameron@...wei.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@...wei.com> Reviewed-by: Barry Song <song.bao.hua@...ilicon.com> Reviewed-by: Hanjun Guo <guohanjun@...wei.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com> Signed-off-by: Sasha Levin <sashal@...nel.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]; } -- 2.27.0
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