| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.11 108/601] KVM: arm/arm64: Fix KVM_VGIC_V3_ADDR_TYPE_REDIST read | Date | Wed, 12 May 2021 16:43:05 +0200 |
| |
From: Eric Auger <eric.auger@redhat.com>
commit 94ac0835391efc1a30feda6fc908913ec012951e upstream.
When reading the base address of the a REDIST region through KVM_VGIC_V3_ADDR_TYPE_REDIST we expect the redistributor region list to be populated with a single element.
However list_first_entry() expects the list to be non empty. Instead we should use list_first_entry_or_null which effectively returns NULL if the list is empty.
Fixes: dbd9733ab674 ("KVM: arm/arm64: Replace the single rdist region by a list") Cc: <Stable@vger.kernel.org> # v4.18+ Signed-off-by: Eric Auger <eric.auger@redhat.com> Reported-by: Gavin Shan <gshan@redhat.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20210412150034.29185-1-eric.auger@redhat.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- arch/arm64/kvm/vgic/vgic-kvm-device.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/arch/arm64/kvm/vgic/vgic-kvm-device.c +++ b/arch/arm64/kvm/vgic/vgic-kvm-device.c @@ -87,8 +87,8 @@ int kvm_vgic_addr(struct kvm *kvm, unsig r = vgic_v3_set_redist_base(kvm, 0, *addr, 0); goto out; } - rdreg = list_first_entry(&vgic->rd_regions, - struct vgic_redist_region, list); + rdreg = list_first_entry_or_null(&vgic->rd_regions, + struct vgic_redist_region, list); if (!rdreg) addr_ptr = &undef_value; else
|