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Fix off-by-one in DHCPv6 FQDN option decoding.

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This commit is contained in:
Simon Kelley
2012-03-30 20:48:20 +01:00
parent 5ef33279f2
commit fbbc14541a
1 changed files with 22 additions and 22 deletions
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38
src/rfc3315.c
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@@ -349,28 +349,28 @@ static int dhcp6_no_relay(int msg_type, struct in6_addr *link_address, struct dh
if (len != 0 && len < 255)
{
unsigned char *pp, *op = opt6_ptr(opt, 1);
char *pq = daemon->dhcp_buff;
unsigned char *pp, *op = opt6_ptr(opt, 1);
char *pq = daemon->dhcp_buff;
pp = op;
while (*op != 0 && ((op + (*op) + 1) - pp) < len)
{
memcpy(pq, op+1, *op);
pq += *op;
op += (*op)+1;
*(pq++) = '.';
}
pp = op;
while (*op != 0 && ((op + (*op)) - pp) < len)
{
memcpy(pq, op+1, *op);
pq += *op;
op += (*op)+1;
*(pq++) = '.';
}
if (pq != daemon->dhcp_buff)
pq--;
*pq = 0;
if (pq != daemon->dhcp_buff)
pq--;
*pq = 0;
if (legal_hostname(daemon->dhcp_buff))
{
client_hostname = daemon->dhcp_buff;
if (option_bool(OPT_LOG_OPTS))
my_syslog(MS_DHCP | LOG_INFO, _("%u client provides name: %s"), xid, client_hostname);
}
if (legal_hostname(daemon->dhcp_buff))
{
client_hostname = daemon->dhcp_buff;
if (option_bool(OPT_LOG_OPTS))
my_syslog(MS_DHCP | LOG_INFO, _("%u client provides name: %s"), xid, client_hostname);
}
}
}