KVM: arm/arm64: Fix KVM_VGIC_V3_ADDR_TYPE_REDIST read

stable inclusion
from stable-5.10.37
commit ae996824da9b1315a5ce6e085660e2486ec06dc8
bugzilla: 51868
CVE: NA

--------------------------------

commit 94ac0835 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: dbd9733a ("KVM: arm/arm64: Replace the single rdist region by a list")
Cc: <Stable@vger.kernel.org> # v4.18+
Signed-off-by: NEric Auger <eric.auger@redhat.com>
Reported-by: NGavin Shan <gshan@redhat.com>
Signed-off-by: NMarc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20210412150034.29185-1-eric.auger@redhat.comSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Acked-by: NWeilong Chen <chenweilong@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

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

@@ -87,7 +87,7 @@ int kvm_vgic_addr(struct kvm *kvm, unsigned long type, u64 *addr, bool write)
 			r = vgic_v3_set_redist_base(kvm, 0, *addr, 0);
 			goto out;
 		}
-		rdreg = list_first_entry(&vgic->rd_regions,
+		rdreg = list_first_entry_or_null(&vgic->rd_regions,
 						 struct vgic_redist_region, list);
 		if (!rdreg)
 			addr_ptr = &undef_value;