vhost: validate index in guest notification API

This patch validates the queue index parameter, in order
to ensure neither out-of-bound accesses nor NULL pointer
dereferencing happen.

Fixes: 9eed6bfd2efb ("vhost: allow to enable or disable features")
Cc: stable@dpdk.org
Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Reviewed-by: Chenbo Xia <chenbo.xia@intel.com>

diff --git a/lib/librte_vhost/vhost.c b/lib/librte_vhost/vhost.c
index 193dafc..801a1a5 100644 (file)
--- a/lib/librte_vhost/vhost.c
+++ b/lib/librte_vhost/vhost.c
@@ -1352,7 +1352,12 @@ rte_vhost_enable_guest_notification(int vid, uint16_t queue_id, int enable)
        if (!dev)
                return -1;
 
+       if (queue_id >= VHOST_MAX_VRING)
+               return -1;
+
        vq = dev->virtqueue[queue_id];
+       if (!vq)
+               return -1;
 
        rte_spinlock_lock(&vq->access_lock);