Fix for potential use of uninitialized variables

The code allowed for the command 'set interface unnumbered'
to be processed without specifying any parameters,
thus the set logic of the command would have been using uninitialized
variables 'unnumbered_sw_if_index' and 'inherit_from_sw_if_index'.

Change-Id: I4de14fa1096527c5c48f74304db379f9953760a8
Signed-off-by: Igor Mikhailov (imichail) <imichail@cisco.com>

diff --git a/vnet/vnet/interface_cli.c b/vnet/vnet/interface_cli.c
index 477716d..f7d42a7 100644 (file)
--- a/vnet/vnet/interface_cli.c
+++ b/vnet/vnet/interface_cli.c
@@ -815,27 +815,17 @@ set_unnumbered (vlib_main_t * vm,
   int is_set = 0;
   int is_del = 0;
 
-  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
-    {
-
-      if (unformat (input, "%U use %U",
-                   unformat_vnet_sw_interface, vnm, &unnumbered_sw_if_index,
-                   unformat_vnet_sw_interface, vnm,
-                   &inherit_from_sw_if_index))
-       is_set = 1;
-      else if (unformat (input, "del %U",
-                        unformat_vnet_sw_interface,
-                        vnm, &unnumbered_sw_if_index))
-       is_del = 1;
-      else
-       {
-         if (is_set || is_del)
-           break;
-         else
-           return clib_error_return
-             (0, "parse error '%U'", format_unformat_error, input);
-       }
-    }
+  if (unformat (input, "%U use %U",
+               unformat_vnet_sw_interface, vnm, &unnumbered_sw_if_index,
+               unformat_vnet_sw_interface, vnm, &inherit_from_sw_if_index))
+    is_set = 1;
+  else if (unformat (input, "del %U",
+                    unformat_vnet_sw_interface, vnm,
+                    &unnumbered_sw_if_index))
+    is_del = 1;
+  else
+    return clib_error_return (0, "parse error '%U'",
+                             format_unformat_error, input);
 
   si = vnet_get_sw_interface (vnm, unnumbered_sw_if_index);
   if (is_del)
@@ -843,7 +833,7 @@ set_unnumbered (vlib_main_t * vm,
       si->flags &= ~(VNET_SW_INTERFACE_FLAG_UNNUMBERED);
       si->unnumbered_sw_if_index = (u32) ~ 0;
     }
-  else
+  else if (is_set)
     {
       si->flags |= VNET_SW_INTERFACE_FLAG_UNNUMBERED;
       si->unnumbered_sw_if_index = inherit_from_sw_if_index;
@@ -855,7 +845,7 @@ set_unnumbered (vlib_main_t * vm,
 /* *INDENT-OFF* */
 VLIB_CLI_COMMAND (set_unnumbered_command, static) = {
   .path = "set interface unnumbered",
-  .short_help = "set interface unnumbered [<intfc> use <intfc>][del <intfc>]",
+  .short_help = "set interface unnumbered [<intfc> use <intfc> | del <intfc>]",
   .function = set_unnumbered,
 };
 /* *INDENT-ON* */