KVM: arm64: vgic-its: Fix handling of indirect tables

The current code will fail on valid indirect tables, and happily
use the ones that are pointing out of the guest RAM. Funny what a
small "!" can do for you...

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

diff --git a/virt/kvm/arm/vgic/vgic-its.c b/virt/kvm/arm/vgic/vgic-its.c
index f427fa2..d6697c4 100644 (file)
--- a/virt/kvm/arm/vgic/vgic-its.c
+++ b/virt/kvm/arm/vgic/vgic-its.c
@@ -702,9 +702,9 @@ static bool vgic_its_check_device_id(struct kvm *kvm, struct vgic_its *its,
                return false;
 
        /* Each 1st level entry is represented by a 64-bit value. */
-       if (!kvm_read_guest(kvm,
-                           BASER_ADDRESS(r) + index * sizeof(indirect_ptr),
-                           &indirect_ptr, sizeof(indirect_ptr)))
+       if (kvm_read_guest(kvm,
+                          BASER_ADDRESS(r) + index * sizeof(indirect_ptr),
+                          &indirect_ptr, sizeof(indirect_ptr)))
                return false;
 
        /* check the valid bit of the first level entry */