VPP-635: CLI Memory leak with invalid parameter

In the CLI parsing, below is a common pattern:
  /* Get a line of input. */
  if (!unformat_user (input, unformat_line_input, line_input))
    return 0;

  while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
    {
      if (unformat (line_input, "x"))
	x = 1;
      :
      else
	return clib_error_return (0, "unknown input `%U'",
				  format_unformat_error, line_input);
    }
  unformat_free (line_input);

The 'else' returns if an unknown string is encountered. There a memory
leak because the 'unformat_free(line_input)' is not called. There is a
large number of instances of this pattern.

Replaced the previous pattern with:
  /* Get a line of input. */
  if (!unformat_user (input, unformat_line_input, line_input))
    return 0;

  while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
    {
      if (unformat (line_input, "x"))
	x = 1;
      :
      else
        {
	  error = clib_error_return (0, "unknown input `%U'",
				     format_unformat_error, line_input);
	  goto done:
        }
    }

  /* ...Remaining code... */

done:
  unformat_free (line_input);
  return error;
}

In multiple files, 'unformat_free (line_input);' was never called, so
there was a memory leak whether an invalid string was entered or not.

Also, there were multiple instance where:
	  error = clib_error_return (0, "unknown input `%U'",
				     format_unformat_error, line_input);
used 'input' as the last parameter instead of 'line_input'. The result
is that output did not contain the substring in error, instead just an
empty string. Fixed all of those as well.

There are a lot of file, and very mind numbing work, so tried to keep
it to a pattern to avoid mistakes.

Change-Id: I8902f0c32a47dd7fb3bb3471a89818571702f1d2
Signed-off-by: Billy McFall <bmcfall@redhat.com>
Signed-off-by: Dave Barach <dave@barachs.net>

1 files changed, 21 insertions, 6 deletions

diff --git a/src/vnet/ip/ip6_neighbor.c b/src/vnet/ip/ip6_neighbor.c
index 7229591e..6b53137f 100644
--- a/src/vnet/ip/ip6_neighbor.c
+++ b/src/vnet/ip/ip6_neighbor.c
@@ -2923,7 +2923,10 @@ ip6_neighbor_cmd (vlib_main_t * vm, unformat_input_t * main_input,
       else if (unformat (line_input, "ra-lifetime"))
 	{
 	  if (!unformat (line_input, "%d", &ra_lifetime))
-	    return (error = unformat_parse_error (line_input));
+	    {
+	      error = unformat_parse_error (line_input);
+	      goto done;
+	    }
 	  use_lifetime = 1;
 	  break;
 	}
@@ -2931,13 +2934,19 @@ ip6_neighbor_cmd (vlib_main_t * vm, unformat_input_t * main_input,
 	{
 	  if (!unformat
 	      (line_input, "%d %d", &ra_initial_count, &ra_initial_interval))
-	    return (error = unformat_parse_error (line_input));
+	    {
+	      error = unformat_parse_error (line_input);
+	      goto done;
+	    }
 	  break;
 	}
       else if (unformat (line_input, "ra-interval"))
 	{
 	  if (!unformat (line_input, "%d", &ra_max_interval))
-	    return (error = unformat_parse_error (line_input));
+	    {
+	      error = unformat_parse_error (line_input);
+	      goto done;
+	    }
 
 	  if (!unformat (line_input, "%d", &ra_min_interval))
 	    ra_min_interval = 0;
@@ -2949,7 +2958,10 @@ ip6_neighbor_cmd (vlib_main_t * vm, unformat_input_t * main_input,
 	  break;
 	}
       else
-	return (unformat_parse_error (line_input));
+	{
+	  error = unformat_parse_error (line_input);
+	  goto done;
+	}
     }
 
   if (add_radv_info)
@@ -3006,7 +3018,10 @@ ip6_neighbor_cmd (vlib_main_t * vm, unformat_input_t * main_input,
 	  else if (unformat (line_input, "no-onlink"))
 	    no_onlink = 1;
 	  else
-	    return (unformat_parse_error (line_input));
+	    {
+	      error = unformat_parse_error (line_input);
+	      goto done;
+	    }
 	}
 
       ip6_neighbor_ra_prefix (vm, sw_if_index,
@@ -3018,9 +3033,9 @@ ip6_neighbor_cmd (vlib_main_t * vm, unformat_input_t * main_input,
 			      off_link, no_autoconfig, no_onlink, is_no);
     }
 
+done:
   unformat_free (line_input);
 
-done:
   return error;
 }