KVM: arm64: vgic-v2: Check for non-NULL vCPU in vgic_v2_parse_attr()

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[ Upstream commit 6ddb4f372f ]

vgic_v2_parse_attr() is responsible for finding the vCPU that matches
the user-provided CPUID, which (of course) may not be valid. If the ID
is invalid, kvm_get_vcpu_by_id() returns NULL, which isn't handled
gracefully.

Similar to the GICv3 uaccess flow, check that kvm_get_vcpu_by_id()
actually returns something and fail the ioctl if not.

Cc: stable@vger.kernel.org
Fixes: 7d450e2821 ("KVM: arm/arm64: vgic-new: Add userland access to VGIC dist registers")
Reported-by: Alexander Potapenko <glider@google.com>
Tested-by: Alexander Potapenko <glider@google.com>
Reviewed-by: Alexander Potapenko <glider@google.com>
Reviewed-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20240424173959.3776798-2-oliver.upton@linux.dev
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Oliver Upton 2024-04-24 17:39:58 +00:00 • committed by Greg Kroah-Hartman

parent 5ee5997a08

commit 17db92da8b

1 changed files with 4 additions and 4 deletions

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arch/arm64/kvm/vgic/vgic-kvm-device.c

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