Bug 92091

	You can cause a panic (page fault) by supplying a non AF_INET address
	as parameter to SIOCSIFADDR.  The command will fail, removing the
	temporary address from the IP hash, which it was never added to.

Fix: Only remove the temporary in_ifaddr structure from the hash if it is
	actually an AF_INET address:
How-To-Repeat: 
#include    <sys/types.h>
#include    <sys/socket.h>
#include    <sys/sockio.h>
#include    <net/if.h>
#include    <netinet/in.h>

#include    <stdio.h>
#include    <sysexits.h>
#include    <err.h>

int
main(int ac, char *av[])
{
    const char *ifname;
    int sfd;
    struct ifreq ifr;
    register int i;

    if (ac != 2)
    {
	fprintf(stderr, "usage: %s <ifname>\n", getprogname());
	return EX_USAGE;
    }

    if ((sfd = socket(PF_INET, SOCK_DGRAM, 0)) == -1)
	err(EX_OSERR, "create socket");

    bzero(&ifr, sizeof(ifr));
    strlcpy(ifr.ifr_name, av[1], sizeof(ifr.ifr_name));
    ifr.ifr_addr.sa_len = 0;
    ifr.ifr_addr.sa_family = AF_MAX;
    for (i = 0; i < 2; ++i)
	if (ioctl(sfd, SIOCSIFADDR, &ifr) == -1)
	    err(EX_OSERR, "SIOCSIFADDR");

    close(sfd);

    return EX_OK;
}