Fix crash with worker threads on 4K VXLAN/BD setup (VPP-907)

[vpp.git] / src / vnet / l2 / l2_fib.c

diff --git a/src/vnet/l2/l2_fib.c b/src/vnet/l2/l2_fib.c
index 6f8f6e0..4ed1698 100644 (file)
--- a/src/vnet/l2/l2_fib.c
+++ b/src/vnet/l2/l2_fib.c
@@ -413,6 +413,13 @@ l2fib_add (vlib_main_t * vm,
        }
     }
 
+  if (vec_len (l2input_main.configs) <= sw_if_index)
+    {
+      error = clib_error_return (0, "Interface sw_if_index %d not in L2 mode",
+                                sw_if_index);
+      goto done;
+    }
+
   if (filter_mac)
     l2fib_add_filter_entry (mac, bd_index);
   else