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(error: -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, res: &len, len: sizeof(len)); |
32 | if (IS_ERR(ptr: p)) |
33 | return p; |
34 | q = (const void *)((const char *)p + len); |
35 | if (unlikely(q > end || q < p)) |
36 | return ERR_PTR(error: -EFAULT); |
37 | if (len) { |
38 | dest->data = kmemdup(p, size: len, GFP_KERNEL); |
39 | if (unlikely(dest->data == NULL)) |
40 | return ERR_PTR(error: -ENOMEM); |
41 | } else |
42 | dest->data = NULL; |
43 | dest->len = len; |
44 | return q; |
45 | } |
46 | |