net/sunrpc/auth_gss/auth_gss_internal.h

   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
  15 static inline const void *
  16 simple_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
  25 static inline const void *
  26 simple_get_netobj_noprof(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_noprof(p, len, GFP_KERNEL);
  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
  47 #define simple_get_netobj(...)  alloc_hooks(simple_get_netobj_noprof(__VA_ARGS__))