[dpdk-dev] [PATCH v4 3/3] vhost: Check offset value

[Ouyang Changchun]

This patch checks the packet length offset value, and checks if the extra bytes inside buffer
cross page boundary.

Signed-off-by: Changchun Ouyang <changchun.ouyang at intel.com>
---
 examples/vhost/main.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/examples/vhost/main.c b/examples/vhost/main.c
index 2916313..a93f7a0 100644
--- a/examples/vhost/main.c
+++ b/examples/vhost/main.c
@@ -1110,7 +1110,8 @@ virtio_tx_route(struct vhost_dev *vdev, struct rte_mbuf *m, uint16_t vlan_tag)
 	}
 
 	if (vm2vm_mode == VM2VM_HARDWARE) {
-		if (find_local_dest(dev, m, &offset, &vlan_tag) != 0) {
+		if (find_local_dest(dev, m, &offset, &vlan_tag) != 0 ||
+			offset > rte_pktmbuf_tailroom(m)) {
 			rte_pktmbuf_free(m);
 			return;
 		}
@@ -1896,7 +1897,9 @@ virtio_dev_tx_zcp(struct virtio_net *dev)
 
 		/* Buffer address translation. */
 		buff_addr = gpa_to_vva(dev, desc->addr);
-		phys_addr = gpa_to_hpa(vdev, desc->addr, desc->len, &addr_type);
+		/* Need check extra VLAN_HLEN size for inserting VLAN tag */
+		phys_addr = gpa_to_hpa(vdev, desc->addr, desc->len + VLAN_HLEN,
+			&addr_type);
 
 		if (likely(packet_success < (free_entries - 1)))
 			/* Prefetch descriptor index. */
-- 
1.8.4.2