vhost: fix avail idx update error when desc copy failed
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Commit Message
When copy_desc_to_mbuf function failed, i added 1.
And last_avail_idx added i, other than i - 1.
It may cause that the first mbuf in mbuf-list is dropped,
the second mbuf in mbuf-list is received in the following
rx procedure.
And The pkt_len of the second mbuf is zero, resulting in
segment fault when parsing the mbuf.
Fixes: 0fd5608ef97f ("vhost: handle mbuf allocation failure")
Cc: stable@dpdk.org
Signed-off-by: Gaoxiang Liu <liugaoxiang@huawei.com>
---
lib/vhost/virtio_net.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
@@ -2850,7 +2850,7 @@ virtio_dev_tx_split(struct virtio_net *dev, struct vhost_virtqueue *vq,
if (dropped)
rte_pktmbuf_free_bulk(&pkts[i - 1], count - i + 1);
- vq->last_avail_idx += i;
+ vq->last_avail_idx += i - 1;
do_data_copy_dequeue(vq);
if (unlikely(i < count))