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