[dpdk-stable] [PATCH] net/ifc: fix unchecked return value

[Ye Xiaolong]

On 11/26, Xiao Wang wrote:
>It's possible that we fail to get the IOMMU group of ifcvf device, this
>patch adds a check on the return value.
>
>Coverity issue: 349894
>Fixes: a3f8150eac6d ("net/ifcvf: add ifcvf vDPA driver")
>Cc: stable at dpdk.org
>
>Signed-off-by: Xiao Wang <xiao.w.wang at intel.com>
>---
> drivers/net/ifc/ifcvf_vdpa.c | 8 ++++++--
> 1 file changed, 6 insertions(+), 2 deletions(-)
>
>diff --git a/drivers/net/ifc/ifcvf_vdpa.c b/drivers/net/ifc/ifcvf_vdpa.c
>index 9c562def0..da4667ba5 100644
>--- a/drivers/net/ifc/ifcvf_vdpa.c
>+++ b/drivers/net/ifc/ifcvf_vdpa.c
>@@ -136,15 +136,19 @@ ifcvf_vfio_setup(struct ifcvf_internal *internal)
> 	struct rte_pci_device *dev = internal->pdev;
> 	char devname[RTE_DEV_NAME_MAX_LEN] = {0};
> 	int iommu_group_num;
>-	int i;
>+	int i, ret;
> 
> 	internal->vfio_dev_fd = -1;
> 	internal->vfio_group_fd = -1;
> 	internal->vfio_container_fd = -1;
> 
> 	rte_pci_device_name(&dev->addr, devname, RTE_DEV_NAME_MAX_LEN);
>-	rte_vfio_get_group_num(rte_pci_get_sysfs_path(), devname,
>+	ret = rte_vfio_get_group_num(rte_pci_get_sysfs_path(), devname,
> 			&iommu_group_num);
>+	if (ret <= 0) {
>+		DRV_LOG(ERR, "%s failed to get IOMMU group", devname);
>+		return -1;
>+	}
> 
> 	internal->vfio_container_fd = rte_vfio_container_create();
> 	if (internal->vfio_container_fd < 0)
>-- 
>2.15.1
>

Reviewed-by: Xiaolong Ye <xiaolong.ye at intel.com>