// SPDX-License-Identifier: BSD-3-Clause
/*
 * linux/net/sunrpc/auth_gss/auth_gss_internal.h
 *
 * Internal definitions for RPCSEC_GSS client authentication
 *
 * Copyright (c) 2000 The Regents of the University of Michigan.
 * All rights reserved.
 *
 */
#include <linux/err.h>
#include <linux/string.h>
#include <linux/sunrpc/xdr.h>

static inline const void *
simple_get_bytes(const void *p, const void *end, void *res, size_t len)
{
        const void *q = (const void *)((const char *)p + len);
        if (unlikely(q > end || q < p))
                return ERR_PTR(-EFAULT);
        memcpy(res, p, len);
        return q;
}

static inline const void *
simple_get_netobj_noprof(const void *p, const void *end, struct xdr_netobj *dest)
{
        const void *q;
        unsigned int len;

        p = simple_get_bytes(p, end, &len, sizeof(len));
        if (IS_ERR(p))
                return p;
        q = (const void *)((const char *)p + len);
        if (unlikely(q > end || q < p))
                return ERR_PTR(-EFAULT);
        if (len) {
                dest->data = kmemdup_noprof(p, len, GFP_KERNEL);
                if (unlikely(dest->data == NULL))
                        return ERR_PTR(-ENOMEM);
        } else
                dest->data = NULL;
        dest->len = len;
        return q;
}

#define simple_get_netobj(...)  alloc_hooks(simple_get_netobj_noprof(__VA_ARGS__))