[v4 1/5] vhost: skip crypto op fetch before vring init

[Gowrishankar Muthukrishnan <gmuthukrishn@marvell.com>]

Until virtio avail ring is initialized (by VHOST_USER_SET_VRING_ADDR),
worker thread should not try to fetch crypto op, which would lead to
memory fault.

Fixes: 939066d96563 ("vhost/crypto: add public function implementation")
Cc: stable@dpdk.org

Signed-off-by: Gowrishankar Muthukrishnan <gmuthukrishn@marvell.com>
---
 lib/vhost/vhost_crypto.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/lib/vhost/vhost_crypto.c b/lib/vhost/vhost_crypto.c
index 3dc41a3bd5..55ea24710e 100644
--- a/lib/vhost/vhost_crypto.c
+++ b/lib/vhost/vhost_crypto.c
@@ -1580,6 +1580,16 @@ rte_vhost_crypto_fetch_requests(int vid, uint32_t qid,
 
 	vq = dev->virtqueue[qid];
 
+	if (unlikely(vq == NULL)) {
+		VC_LOG_ERR("Invalid virtqueue %u", qid);
+		return 0;
+	}
+
+	if (unlikely(vq->avail == NULL)) {
+		VC_LOG_DBG("Virtqueue ring not yet initialized %u", qid);
+		return 0;
+	}
+
 	avail_idx = *((volatile uint16_t *)&vq->avail->idx);
 	start_idx = vq->last_used_idx;
 	count = avail_idx - start_idx;
-- 
2.25.1