span: crash in span_mirror [VPP-1254]

[vpp.git] / src / vnet / span / node.c

diff --git a/src/vnet/span/node.c b/src/vnet/span/node.c
index 8e2105b..13e92ab 100644 (file)
--- a/src/vnet/span/node.c
+++ b/src/vnet/span/node.c
@@ -70,9 +70,14 @@ span_mirror (vlib_main_t * vm, vlib_node_runtime_t * node, u32 sw_if_index0,
   vnet_main_t *vnm = &vnet_main;
   u32 *to_mirror_next = 0;
   u32 i;
+  span_interface_t *si0;
+  span_mirror_t *sm0;
 
-  span_interface_t *si0 = vec_elt_at_index (sm->interfaces, sw_if_index0);
-  span_mirror_t *sm0 = &si0->mirror_rxtx[sf][rxtx];
+  if (sw_if_index0 >= vec_len (sm->interfaces))
+    return;
+
+  si0 = vec_elt_at_index (sm->interfaces, sw_if_index0);
+  sm0 = &si0->mirror_rxtx[sf][rxtx];
 
   if (sm0->num_mirror_ports == 0)
     return;