[SECURITY PATCH 098/117] kern/parser: Refactor grub_parser_split_cmdline() cleanup

[Daniel Kiper]

From: Chris Coulson <chris.coulson@canonical.com>

Introduce a common function epilogue used for cleaning up on all
return paths, which will simplify additional error handling to be
introduced in a subsequent commit.

Signed-off-by: Chris Coulson <chris.coulson@canonical.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
---
 grub-core/kern/parser.c | 35 ++++++++++++++++++++---------------
 1 file changed, 20 insertions(+), 15 deletions(-)

diff --git a/grub-core/kern/parser.c b/grub-core/kern/parser.c
index 572c67089..e010eaa1f 100644
--- a/grub-core/kern/parser.c
+++ b/grub-core/kern/parser.c
@@ -221,19 +221,13 @@ grub_parser_split_cmdline (const char *cmdline,
 
          if (process_char (*rp, buffer, &bp, varname, &vp, state, argc,
                            &newstate) != GRUB_ERR_NONE)
-           {
-             if (rd != cmdline)
-               grub_free (rd);
-             return grub_errno;
-           }
+           goto fail;
+
          state = newstate;
        }
     }
   while (state != GRUB_PARSER_STATE_TEXT && !check_varstate (state));
 
-  if (rd != cmdline)
-    grub_free (rd);
-
   /* A special case for when the last character was part of a
      variable.  */
   add_var (varname, &bp, &vp, state, GRUB_PARSER_STATE_TEXT);
@@ -243,20 +237,20 @@ grub_parser_split_cmdline (const char *cmdline,
 
   /* If there are no args, then we're done. */
   if (!*argc)
-    return 0;
+    {
+      grub_errno = GRUB_ERR_NONE;
+      goto out;
+    }
 
   /* Reserve memory for the return values.  */
   args = grub_malloc (bp - buffer);
   if (!args)
-    return grub_errno;
+    goto fail;
   grub_memcpy (args, buffer, bp - buffer);
 
   *argv = grub_calloc (*argc + 1, sizeof (char *));
   if (!*argv)
-    {
-      grub_free (args);
-      return grub_errno;
-    }
+    goto fail;
 
   /* The arguments are separated with 0's, setup argv so it points to
      the right values.  */
@@ -269,7 +263,18 @@ grub_parser_split_cmdline (const char *cmdline,
       bp++;
     }
 
-  return 0;
+  grub_errno = GRUB_ERR_NONE;
+
+ out:
+  if (rd != cmdline)
+    grub_free (rd);
+
+  return grub_errno;
+
+ fail:
+  grub_free (*argv);
+  grub_free (args);
+  goto out;
 }
 
 /* Helper for grub_parser_execute.  */
-- 
2.11.0