From 38ab5672b599df8ef201ca6733c9b008c37fdfa3 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Beno=C3=AEt=20Ganne?= <bganne@cisco.com>
Date: Wed, 22 Apr 2020 19:14:03 +0200
Subject: [PATCH] vcl: fix use-after-free
MIME-Version: 1.0
Content-Type: text/plain; charset=utf8
Content-Transfer-Encoding: 8bit

Make sure we disconnect from vlib prior to free-ing the last worker, as
we'll need to access it.

Type: fix

Change-Id: Id5bdd17f0f5efa1ce52021b4270eb4f1e95cc61d
Signed-off-by: Benoît Ganne <bganne@cisco.com>
---
 src/vcl/vppcom.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/vcl/vppcom.c b/src/vcl/vppcom.c
index 186b08468fd..579cbc1657b 100644
--- a/src/vcl/vppcom.c
+++ b/src/vcl/vppcom.c
@@ -1224,12 +1224,13 @@ vppcom_app_destroy (void)
 
   /* *INDENT-OFF* */
   pool_foreach (wrk, vcm->workers, ({
+    if (pool_elts (vcm->workers) == 1)
+      vl_client_disconnect_from_vlib ();
     vcl_worker_cleanup (wrk, 0 /* notify vpp */ );
   }));
   /* *INDENT-ON* */
 
   vcl_elog_stop (vcm);
-  vl_client_disconnect_from_vlib ();
 
   /*
    * Free the heap and fix vcm
-- 
2.16.6