From 81e9694830209207cbba599b62858c97c3ed5cfe Mon Sep 17 00:00:00 2001
From: Fan Zhang <roy.fan.zhang@intel.com>
Date: Tue, 14 Apr 2020 16:52:47 +0100
Subject: vhost/crypto: fix incorrect descriptor deduction

This patch fixes the incorrect descriptor deduction for vhost crypto.

CVE-2020-14378
Fixes: 16d2e718b8ce ("vhost/crypto: fix possible out of bound access")
Cc: stable@dpdk.org

Signed-off-by: Fan Zhang <roy.fan.zhang@intel.com>
Acked-by: Chenbo Xia <chenbo.xia@intel.com>

reference:https://git.dpdk.org/dpdk-stable/commit/?h=19.11&id=81e969483020
Signed-off-by: gaoxingwang <gaoxingwang@huawei.com>
---
 lib/librte_vhost/vhost_crypto.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/librte_vhost/vhost_crypto.c b/lib/librte_vhost/vhost_crypto.c
index 0f9df40..86747dd 100644
--- a/lib/librte_vhost/vhost_crypto.c
+++ b/lib/librte_vhost/vhost_crypto.c
@@ -530,13 +530,14 @@ move_desc(struct vring_desc *head, struct vring_desc **cur_desc,
 	int left = size - desc->len;
 
 	while ((desc->flags & VRING_DESC_F_NEXT) && left > 0) {
-		(*nb_descs)--;
 		if (unlikely(*nb_descs == 0 || desc->next >= vq_size))
 			return -1;
 
 		desc = &head[desc->next];
 		rte_prefetch0(&head[desc->next]);
 		left -= desc->len;
+		if (left > 0)
+			(*nb_descs)--;
 	}
 
 	if (unlikely(left > 0))
-- 
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