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sd-dhcp6-client: properly calculate buffer size when parsing options

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Also make pointer calculations more explicit so they are
easier to understand.
This commit is contained in:
Zbigniew Jędrzejewski-Szmek 2014-08-30 18:31:21 -04:00
parent d182960ae9
commit 44481a8b53
Notes: Lennart Poettering 2014-10-24 17:47:29 +02:00 
Backport: bugfix
2 changed files with 5 additions and 2 deletions
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5
src/libsystemd-network/sd-dhcp6-client.c
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@ -583,12 +583,15 @@ static int client_parse_message(sd_dhcp6_client *client,
DHCP6Message *message, size_t len,
sd_dhcp6_lease *lease) {
int r;
uint8_t *optval, *option = (uint8_t *)(message + 1), *id = NULL;
uint8_t *optval, *option, *id = NULL;
uint16_t optcode, status;
size_t optlen, id_len;
bool clientid = false;
be32_t iaid_lease;
option = (uint8_t *)message + sizeof(DHCP6Message);
len -= sizeof(DHCP6Message);
while ((r = dhcp6_option_parse(&option, &len, &optcode, &optlen,
&optval)) >= 0) {
switch (optcode) {

2
src/libsystemd-network/test-dhcp6-client.c
View File

@ -205,7 +205,7 @@ static uint8_t msg_reply[173] = {
static int test_advertise_option(sd_event *e) {
_cleanup_dhcp6_lease_free_ sd_dhcp6_lease *lease = NULL;
DHCP6Message *advertise = (DHCP6Message *)msg_advertise;
uint8_t *optval, *opt = &msg_advertise[sizeof(DHCP6Message)];
uint8_t *optval, *opt = msg_advertise + sizeof(DHCP6Message);
uint16_t optcode;
size_t optlen, len = sizeof(msg_advertise) - sizeof(DHCP6Message);
be32_t val;