| Message ID | 20200717175959.899775-2-Jonathan.Cameron@huawei.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | ACPI: Only create NUMA nodes from entries in SRAT or SRAT emulation. | expand |
> -----Original Message----- > From: Jonathan Cameron > Sent: Saturday, July 18, 2020 6:00 AM > To: linux-mm@kvack.org; linux-acpi@vger.kernel.org; > linux-arm-kernel@lists.infradead.org; x86@kernel.org > Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>; Bjorn Helgaas > <bhelgaas@google.com>; linux-pci@vger.kernel.org; martin@geanix.com; Ingo > Molnar <mingo@redhat.com>; linux-ia64@vger.kernel.org; Tony Luck > <tony.luck@intel.com>; Fenghua Yu <fenghua.yu@intel.com>; Thomas > Gleixner <tglx@linutronix.de>; Linuxarm <linuxarm@huawei.com>; Dan > Williams <dan.j.williams@intel.com>; Song Bao Hua (Barry Song) > <song.bao.hua@hisilicon.com>; Jonathan Cameron > <jonathan.cameron@huawei.com> > Subject: [PATCH v2 1/6] ACPI: Add out of bounds and numa_off protections to > pxm_to_node > > 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> > --- > 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 5be5a977da1b..8ef44ee0d76b 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]; > } > -- > 2.19.1
diff --git a/drivers/acpi/numa/srat.c b/drivers/acpi/numa/srat.c index 5be5a977da1b..8ef44ee0d76b 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]; }
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> --- drivers/acpi/numa/srat.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)