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(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_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