1ba6dfce4SDave Wysochanski // SPDX-License-Identifier: BSD-3-Clause
2ba6dfce4SDave Wysochanski /*
3ba6dfce4SDave Wysochanski * linux/net/sunrpc/auth_gss/auth_gss_internal.h
4ba6dfce4SDave Wysochanski *
5ba6dfce4SDave Wysochanski * Internal definitions for RPCSEC_GSS client authentication
6ba6dfce4SDave Wysochanski *
7ba6dfce4SDave Wysochanski * Copyright (c) 2000 The Regents of the University of Michigan.
8ba6dfce4SDave Wysochanski * All rights reserved.
9ba6dfce4SDave Wysochanski *
10ba6dfce4SDave Wysochanski */
11ba6dfce4SDave Wysochanski #include <linux/err.h>
12ba6dfce4SDave Wysochanski #include <linux/string.h>
13ba6dfce4SDave Wysochanski #include <linux/sunrpc/xdr.h>
14ba6dfce4SDave Wysochanski
15ba6dfce4SDave Wysochanski static inline const void *
simple_get_bytes(const void * p,const void * end,void * res,size_t len)16ba6dfce4SDave Wysochanski simple_get_bytes(const void *p, const void *end, void *res, size_t len)
17ba6dfce4SDave Wysochanski {
18ba6dfce4SDave Wysochanski const void *q = (const void *)((const char *)p + len);
19ba6dfce4SDave Wysochanski if (unlikely(q > end || q < p))
20ba6dfce4SDave Wysochanski return ERR_PTR(-EFAULT);
21ba6dfce4SDave Wysochanski memcpy(res, p, len);
22ba6dfce4SDave Wysochanski return q;
23ba6dfce4SDave Wysochanski }
24ba6dfce4SDave Wysochanski
25ba6dfce4SDave Wysochanski static inline const void *
simple_get_netobj(const void * p,const void * end,struct xdr_netobj * dest)26ba6dfce4SDave Wysochanski simple_get_netobj(const void *p, const void *end, struct xdr_netobj *dest)
27ba6dfce4SDave Wysochanski {
28ba6dfce4SDave Wysochanski const void *q;
29ba6dfce4SDave Wysochanski unsigned int len;
30ba6dfce4SDave Wysochanski
31ba6dfce4SDave Wysochanski p = simple_get_bytes(p, end, &len, sizeof(len));
32ba6dfce4SDave Wysochanski if (IS_ERR(p))
33ba6dfce4SDave Wysochanski return p;
34ba6dfce4SDave Wysochanski q = (const void *)((const char *)p + len);
35ba6dfce4SDave Wysochanski if (unlikely(q > end || q < p))
36ba6dfce4SDave Wysochanski return ERR_PTR(-EFAULT);
37e4a7d1f7SDave Wysochanski if (len) {
38*4c2883e7STrond Myklebust dest->data = kmemdup(p, len, GFP_KERNEL);
39ba6dfce4SDave Wysochanski if (unlikely(dest->data == NULL))
40ba6dfce4SDave Wysochanski return ERR_PTR(-ENOMEM);
41e4a7d1f7SDave Wysochanski } else
42e4a7d1f7SDave Wysochanski dest->data = NULL;
43ba6dfce4SDave Wysochanski dest->len = len;
44ba6dfce4SDave Wysochanski return q;
45ba6dfce4SDave Wysochanski }
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