net/virtio: fix unchecked return value

Coverity issue: 302861
Fixes: 6ba1f63b5ab0 ("virtio: support specification 1.0")
Cc: stable@dpdk.org
Signed-off-by: Tiwei Bie <tiwei.bie@intel.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>

diff --git a/drivers/net/virtio/virtio_pci.c b/drivers/net/virtio/virtio_pci.c
index 21110cd..c8883c3 100644 (file)
--- a/drivers/net/virtio/virtio_pci.c
+++ b/drivers/net/virtio/virtio_pci.c
@@ -614,9 +614,15 @@ virtio_read_caps(struct rte_pci_device *dev, struct virtio_hw *hw)
                        hw->common_cfg = get_cfg_addr(dev, &cap);
                        break;
                case VIRTIO_PCI_CAP_NOTIFY_CFG:
-                       rte_pci_read_config(dev, &hw->notify_off_multiplier,
+                       ret = rte_pci_read_config(dev,
+                                       &hw->notify_off_multiplier,
                                        4, pos + sizeof(cap));
-                       hw->notify_base = get_cfg_addr(dev, &cap);
+                       if (ret != 4)
+                               PMD_INIT_LOG(DEBUG,
+                                       "failed to read notify_off_multiplier, ret %d",
+                                       ret);
+                       else
+                               hw->notify_base = get_cfg_addr(dev, &cap);
                        break;
                case VIRTIO_PCI_CAP_DEVICE_CFG:
                        hw->dev_cfg = get_cfg_addr(dev, &cap);