[PATCH] KVM: arm64: check for ITS device on MSI injection

[Andre Przywara]

When userspace provides the doorbell address for an MSI to be
injected into the guest, we find a KVM device which feels responsible.
Lets check that this device is really an emulated ITS before we make
real use of the container_of-ed pointer.

Signed-off-by: Andre Przywara <andre.przywara at arm.com>
---
 virt/kvm/arm/vgic/vgic-its.c | 25 +++++++++++++++++++++----
 1 file changed, 21 insertions(+), 4 deletions(-)

diff --git a/virt/kvm/arm/vgic/vgic-its.c b/virt/kvm/arm/vgic/vgic-its.c
index 18a6871..9aeb3a4 100644
--- a/virt/kvm/arm/vgic/vgic-its.c
+++ b/virt/kvm/arm/vgic/vgic-its.c
@@ -471,6 +471,24 @@ static int vgic_its_trigger_msi(struct kvm *kvm, struct vgic_its *its,
 	return 0;
 }
 
+static struct vgic_io_device *vgic_get_its_iodev(struct kvm_io_device *dev)
+{
+	struct vgic_io_device *iodev;
+
+	if (!dev)
+		return NULL;
+
+	if (dev->ops != &kvm_io_gic_ops)
+		return NULL;
+
+	iodev = container_of(dev, struct vgic_io_device, dev);
+
+	if (iodev->iodev_type != IODEV_ITS)
+		return NULL;
+
+	return iodev;
+}
+
 /*
  * Queries the KVM IO bus framework to get the ITS pointer from the given
  * doorbell address.
@@ -493,10 +511,9 @@ int vgic_its_inject_msi(struct kvm *kvm, struct kvm_msi *msi)
 	address = (u64)msi->address_hi << 32 | msi->address_lo;
 
 	kvm_io_dev = kvm_io_bus_get_dev(kvm, KVM_MMIO_BUS, address);
-	if (!kvm_io_dev)
-		return -ENODEV;
-
-	iodev = container_of(kvm_io_dev, struct vgic_io_device, dev);
+	iodev = vgic_get_its_iodev(kvm_io_dev);
+	if (!iodev)
+		return -EINVAL;
 
 	mutex_lock(&iodev->its->its_lock);
 	ret = vgic_its_trigger_msi(kvm, iodev->its, msi->devid, msi->data);
-- 
2.9.0