find_file (const char *currpath, grub_fshelp_node_t currroot,
 	   grub_fshelp_node_t *currfound,
 	   struct grub_fshelp_find_file_closure *c)
 {
 	char *fpath = grub_malloc (grub_strlen (currpath) + 1);
   char *name = fpath;
   char *next;
   enum grub_fshelp_filetype type = GRUB_FSHELP_DIR;
  grub_fshelp_node_t currnode = currroot;
  grub_fshelp_node_t oldnode = currroot;

  c->currroot = currroot;

  grub_strncpy (fpath, currpath, grub_strlen (currpath) + 1);

  /* Remove all leading slashes.  */
  while (*name == '/')
    name++;

   if (! *name)
     {
       *currfound = currnode;
free (fpath);
       return 0;
     }
 
  for (;;)
    {
      int found;
      struct find_file_closure cc;

      /* Extract the actual part from the pathname.  */
      next = grub_strchr (name, '/');
      if (next)
	{
	  /* Remove all leading slashes.  */
	  while (*next == '/')
	    *(next++) = '\0';
	}

      /* At this point it is expected that the current node is a
	 directory, check if this is true.  */
       if (type != GRUB_FSHELP_DIR)
 	{
 	  free_node (currnode, c);
free (fpath);
 	  return grub_error (GRUB_ERR_BAD_FILE_TYPE, "not a directory");
 	}
 
      cc.name = name;
      cc.type = &type;
      cc.oldnode = &oldnode;
      cc.currnode = &currnode;
      /* Iterate over the directory.  */
       found = c->iterate_dir (currnode, iterate, &cc);
       if (! found)
 	{
	  if (grub_errno) {
free (fpath);
 	    return grub_errno;
}
 
 	  break;
 	}

      /* Read in the symlink and follow it.  */
      if (type == GRUB_FSHELP_SYMLINK)
	{
	  char *symlink;

	  /* Test if the symlink does not loop.  */
	  if (++(c->symlinknest) == 8)
 	    {
 	      free_node (currnode, c);
 	      free_node (oldnode, c);
free (fpath);
 	      return grub_error (GRUB_ERR_SYMLINK_LOOP,
 				 "too deep nesting of symlinks");
 	    }

	  symlink = c->read_symlink (currnode);
	  free_node (currnode, c);

 	  if (!symlink)
 	    {
 	      free_node (oldnode, c);
free (fpath);
 	      return grub_errno;
 	    }
 
	  /* The symlink is an absolute path, go back to the root inode.  */
	  if (symlink[0] == '/')
	    {
	      free_node (oldnode, c);
	      oldnode = c->rootnode;
	    }

	  /* Lookup the node the symlink points to.  */
	  find_file (symlink, oldnode, &currnode, c);
	  type = c->foundtype;
	  grub_free (symlink);

 	  if (grub_errno)
 	    {
 	      free_node (oldnode, c);
free (fpath);
 	      return grub_errno;
 	    }
 	}

      free_node (oldnode, c);

      /* Found the node!  */
      if (! next || *next == '\0')
 	{
 	  *currfound = currnode;
 	  c->foundtype = type;
free (fpath);
 	  return 0;
 	}
 
       name = next;
     }
 
free (fpath);
   return grub_error (GRUB_ERR_FILE_NOT_FOUND, "file not found");
 }

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.