[PULL 1/9] virtio-iommu: Fix error handling in virtio_iommu_set_host_iova_ranges()

["Cédric Le Goater" <clg@redhat.com>]

From: Eric Auger <eric.auger@redhat.com>

In case no IOMMUPciBus/IOMMUDevice are found we need to properly
set the error handle and return.

Fixes : Coverity CID 1549006

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Fixes: cf2647a76e ("virtio-iommu: Compute host reserved regions")
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Reviewed-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
---
 hw/virtio/virtio-iommu.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/hw/virtio/virtio-iommu.c b/hw/virtio/virtio-iommu.c
index 7c54c6b5e260e65b555e63809ed247254c785d3f..8fe69ab094f501fced7098f1ba790c26e63aa775 100644
--- a/hw/virtio/virtio-iommu.c
+++ b/hw/virtio/virtio-iommu.c
@@ -563,10 +563,15 @@ static int virtio_iommu_set_host_iova_ranges(VirtIOIOMMU *s, PCIBus *bus,
     int ret = -EINVAL;
 
     if (!sbus) {
-        error_report("%s no sbus", __func__);
+        error_setg(errp, "%s: no IOMMUPciBus found!", __func__);
+        return ret;
     }
 
     sdev = sbus->pbdev[devfn];
+    if (!sdev) {
+        error_setg(errp, "%s: no IOMMUDevice found!", __func__);
+        return ret;
+    }
 
     current_ranges = sdev->host_resv_ranges;
 
-- 
2.45.2