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change OpenSSH's xrealloc() function from being xrealloc(p, new_size) to
xrealloc(p, new_nmemb, new_itemsize).

realloc is particularly prone to integer overflows because it is almost
always allocating "n * size" bytes, so this is a far safer API;
ok deraadt@

/*	$OpenBSD: xmalloc.h,v 1.11 2006/03/25 01:13:23 djm Exp $	*/

/*
 * Author: Tatu Ylonen <ylo@cs.hut.fi>
 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
 *                    All rights reserved
 * Created: Mon Mar 20 22:09:17 1995 ylo
 *
 * Versions of malloc and friends that check their results, and never return
 * failure (they call fatal if they encounter an error).
 *
 * As far as I am concerned, the code I have written for this software
 * can be used freely for any purpose.  Any derived versions of this
 * software must be clearly marked as such, and if the derived work is
 * incompatible with the protocol description in the RFC file, it must be
 * called by a name other than "ssh" or "Secure Shell".
 */

#ifndef XMALLOC_H
#define XMALLOC_H

void	*xmalloc(size_t);
void	*xcalloc(size_t, size_t);
void	*xrealloc(void *, size_t, size_t);
void     xfree(void *);
char	*xstrdup(const char *);
int	 xasprintf(char **, const char *, ...)
                __attribute__((__format__ (printf, 2, 3)))
                __attribute__((__nonnull__ (2)));

#endif				/* XMALLOC_H */