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Use offsetof() instead of sizeof() to get the sizes for dhcpv6_relay_packet

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and dhcpv6_packet in several more places.  Thanks to a report from
Bruno Verstuyft and Vincent Demaertelaere of Excentis.
[ISC-Bugs #27941]
This commit is contained in:
Shawn Routhier
2012-03-20 00:31:34 +00:00
parent d13db163c7
commit b342f2e77c
3 changed files with 13 additions and 4 deletions
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6
server/dhcpv6.c
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@@ -5527,6 +5527,7 @@ dhcpv6_relay_forw(struct data_string *reply_ret, struct packet *packet) {
msg_type = enc_opt_data.data[0];
if ((msg_type == DHCPV6_RELAY_FORW) ||
(msg_type == DHCPV6_RELAY_REPL)) {
int relaylen = (int)(offsetof(struct dhcpv6_relay_packet, options));
relay = (struct dhcpv6_relay_packet *)enc_opt_data.data;
enc_packet->dhcpv6_msg_type = relay->msg_type;
@@ -5539,13 +5540,14 @@ dhcpv6_relay_forw(struct data_string *reply_ret, struct packet *packet) {
if (!parse_option_buffer(enc_packet->options,
relay->options,
enc_opt_data.len-sizeof(*relay),
enc_opt_data.len - relaylen,
&dhcpv6_universe)) {
/* no logging here, as parse_option_buffer() logs all
cases where it fails */
goto exit;
}
} else {
int msglen = (int)(offsetof(struct dhcpv6_packet, options));
msg = (struct dhcpv6_packet *)enc_opt_data.data;
enc_packet->dhcpv6_msg_type = msg->msg_type;
@@ -5556,7 +5558,7 @@ dhcpv6_relay_forw(struct data_string *reply_ret, struct packet *packet) {
if (!parse_option_buffer(enc_packet->options,
msg->options,
enc_opt_data.len-sizeof(*msg),
enc_opt_data.len - msglen,
&dhcpv6_universe)) {
/* no logging here, as parse_option_buffer() logs all
cases where it fails */