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Jonathan Cameron 62ca6d3a90 arm64: acpi: Harden get_cpu_for_acpi_id() against missing CPU entry 
[ Upstream commit 2488444274 ]

In a review discussion of the changes to support vCPU hotplug where
a check was added on the GICC being enabled if was online, it was
noted that there is need to map back to the cpu and use that to index
into a cpumask. As such, a valid ID is needed.

If an MPIDR check fails in acpi_map_gic_cpu_interface() it is possible
for the entry in cpu_madt_gicc[cpu] == NULL.  This function would
then cause a NULL pointer dereference.   Whilst a path to trigger
this has not been established, harden this caller against the
possibility.

Reviewed-by: Gavin Shan <gshan@redhat.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Link: https://lore.kernel.org/r/20240529133446.28446-13-Jonathan.Cameron@huawei.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2024-09-12 11:11:42 +02:00
..
asm arm64: acpi: Harden get_cpu_for_acpi_id() against missing CPU entry 2024-09-12 11:11:42 +02:00
uapi/asm arm64 updates for 6.6 2023-08-28 17:34:54 -07:00