LXR linux/net/sunrpc/auth_gss/auth_gss

   1// SPDX-License-Identifier: BSD-3-Clause
   2/*
   3 * linux/net/sunrpc/auth_gss/auth_gss_internal.h
   4 *
   5 * Internal definitions for RPCSEC_GSS client authentication
   6 *
   7 * Copyright (c) 2000 The Regents of the University of Michigan.
   8 * All rights reserved.
   9 *
  10 */
  11#include <linux/err.h>
  12#include <linux/string.h>
  13#include <linux/sunrpc/xdr.h>
  14
  15static inline const void *
  16simple_get_bytes(const void *p, const void *end, void *res, size_t len)
  17{
  18        const void *q = (const void *)((const char *)p + len);
  19        if (unlikely(q > end || q < p))
  20                return ERR_PTR(-EFAULT);
  21        memcpy(res, p, len);
  22        return q;
  23}
  24
  25static inline const void *
  26simple_get_netobj(const void *p, const void *end, struct xdr_netobj *dest)
  27{
  28        const void *q;
  29        unsigned int len;
  30
  31        p = simple_get_bytes(p, end, &len, sizeof(len));
  32        if (IS_ERR(p))
  33                return p;
  34        q = (const void *)((const char *)p + len);
  35        if (unlikely(q > end || q < p))
  36                return ERR_PTR(-EFAULT);
  37        if (len) {
  38                dest->data = kmemdup(p, len, GFP_NOFS);
  39                if (unlikely(dest->data == NULL))
  40                        return ERR_PTR(-ENOMEM);
  41        } else
  42                dest->data = NULL;
  43        dest->len = len;
  44        return q;
  45}
  46