vhost-user: restart vpp may cause vhost to crash

Fix a typo in vhost_user_rx_discard_packet which may cause
txvq->last_avail_idx to go wild.

Change-Id: Ifaeb58835dff9b7ea82c061442722f1dcaa5d9a4
Signed-off-by: Steven Luong <sluong@cisco.com>
(cherry picked from commit 39382976701926c1f34191c1311829c15a53cb01)

diff --git a/src/vnet/devices/virtio/vhost_user_input.c b/src/vnet/devices/virtio/vhost_user_input.c
index d7f628c..79c66ee 100644 (file)
--- a/src/vnet/devices/virtio/vhost_user_input.c
+++ b/src/vnet/devices/virtio/vhost_user_input.c
@@ -200,7 +200,7 @@ vhost_user_rx_discard_packet (vlib_main_t * vm,
   u16 last_used_idx = txvq->last_used_idx;
   while (discarded_packets != discard_max)
     {
-      if (avail_idx == txvq->last_avail_idx)
+      if (avail_idx == last_avail_idx)
        goto out;
 
       u16 desc_chain_head = txvq->avail->ring[last_avail_idx & mask];