<div style="line-height:1.7;color:#000000;font-size:14px;font-family:Arial"><p style="margin: 0;"><br></p><div style="margin: 0;">Hi, Chen bo, Maxime,</div><div style="margin: 0;"> Please help to review the patch below.</div><div style="margin: 0;">Thanks.</div><div style="margin: 0;">Gaoxiang.</div><pre>-------- Forwarding messages --------
From: "Gaoxiang Liu" <gaoxiangliu0@163.com>
Date: 2022-06-22 09:19:44
To: maxime.coquelin@redhat.com,chenbo.xia@intel.com
Cc: dev@dpdk.org,liugaoxiang@huawei.com,"Gaoxiang Liu" <gaoxiangliu0@163.com>,stable@dpdk.org
Subject: [PATCH v2] vhost: fix avail idx update error when desc copy failed
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>
---
v2:
* Fixed other idx update errors.
---
lib/vhost/virtio_net.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/lib/vhost/virtio_net.c b/lib/vhost/virtio_net.c
index 68a26eb17d..eb254e1024 100644
--- a/lib/vhost/virtio_net.c
+++ b/lib/vhost/virtio_net.c
@@ -2850,11 +2850,11 @@ 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 - dropped;
do_data_copy_dequeue(vq);
- if (unlikely(i < count))
- vq->shadow_used_idx = i;
+ if (unlikely((i - dropped) < count))
+ vq->shadow_used_idx = i - dropped;
if (likely(vq->shadow_used_idx)) {
flush_shadow_used_ring_split(dev, vq);
vhost_vring_call_split(dev, vq);
--
2.32.0
</pre></div>