[dpdk-dev] [PATCH 2/7] vhost: validate index in available entries API

[Maxime Coquelin]

This patch validates the queue index parameter, in order
to ensure neither out-of-bound accesses nor NULL pointer
dereferencing happen.
Fixes: a67f286a6596 ("vhost: export queue free entries")
Cc: sta...@dpdk.org

Signed-off-by: Maxime Coquelin <maxime.coque...@redhat.com>
---
 lib/librte_vhost/vhost.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lib/librte_vhost/vhost.c b/lib/librte_vhost/vhost.c
index 0c9ba3b3af..193dafc369 100644
--- a/lib/librte_vhost/vhost.c
+++ b/lib/librte_vhost/vhost.c
@@ -1260,7 +1260,12 @@ rte_vhost_avail_entries(int vid, uint16_t queue_id)
        if (!dev)
                return 0;
 
+       if (queue_id >= VHOST_MAX_VRING)
+               return 0;
+
        vq = dev->virtqueue[queue_id];
+       if (!vq)
+               return 0;
 
        rte_spinlock_lock(&vq->access_lock);
 
-- 
2.26.2