diff options
Diffstat (limited to 'client')
| -rw-r--r-- | client/dhclient.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/client/dhclient.c b/client/dhclient.c index 580c7126..99f0ec1a 100644 --- a/client/dhclient.c +++ b/client/dhclient.c @@ -3070,8 +3070,15 @@ void script_write_params (client, prefix, lease) if (data.len > 3) { struct iaddr netmask, subnet, broadcast; - memcpy (netmask.iabuf, data.data, data.len); - netmask.len = data.len; + /* + * No matter the length of the subnet-mask option, + * use only the first four octets. Note that + * subnet-mask options longer than 4 octets are not + * in conformance with RFC 2132, but servers with this + * flaw do exist. + */ + memcpy(netmask.iabuf, data.data, 4); + netmask.len = 4; data_string_forget (&data, MDL); subnet = subnet_number (lease -> address, netmask); |