[PATCH 1/2] vhost: fix queue number check when setting inflight FD

[David Marchand]

From: Chenbo Xia <chenbo.xia at intel.com>

In function vhost_user_set_inflight_fd, queue number in inflight
message is used to access virtqueue. However, queue number could
be larger than VHOST_MAX_VRING and cause write OOB as this number
will be used to write inflight info in virtqueue structure. This
patch checks the queue number to avoid the issue and also make
sure virtqueues are allocated before setting inflight information.

Fixes: ad0a4ae491fe ("vhost: checkout resubmit inflight information")
Cc: stable at dpdk.org

Reported-by: Wenxiang Qian <leonwxqian at gmail.com>
Signed-off-by: Chenbo Xia <chenbo.xia at intel.com>
---
 lib/vhost/vhost_user.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/vhost/vhost_user.c b/lib/vhost/vhost_user.c
index 589b950458..1ec4357bee 100644
--- a/lib/vhost/vhost_user.c
+++ b/lib/vhost/vhost_user.c
@@ -2883,6 +2883,9 @@ vhost_user_check_and_alloc_queue_pair(struct virtio_net *dev,
 	case VHOST_USER_SET_VRING_ADDR:
 		vring_idx = ctx->msg.payload.addr.index;
 		break;
+	case VHOST_USER_SET_INFLIGHT_FD:
+		vring_idx = ctx->msg.payload.inflight.num_queues - 1;
+		break;
 	default:
 		return 0;
 	}
-- 
2.23.0