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netutils/dhcpd: correct the option header check

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Signed-off-by: chao.an <anchao@xiaomi.com>
This commit is contained in:
Xiang Xiao 2020-05-14 20:29:22 +08:00 committed by patacongo
parent ed3ac15526
commit 3b98acc87c
1 changed files with 5 additions and 11 deletions
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16
netutils/dhcpd/dhcpd.c
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@ -595,7 +595,7 @@ static inline bool dhcpd_parseoptions(void)
#ifndef CONFIG_NET_DHCP_LIGHT
case DHCP_OPTION_OVERLOAD:
optlen = ptr[DHCPD_OPTION_LENGTH] + 2;
if (optlen >= 1 && optlen < remaining)
if (optlen >= 3 && optlen < remaining)
{
overloaded = ptr[DHCPD_OPTION_DATA];
}
@ -629,7 +629,7 @@ static inline bool dhcpd_parseoptions(void)
case DHCP_OPTION_REQ_IPADDR: /* Requested IP Address */
optlen = ptr[DHCPD_OPTION_LENGTH] + 2;
if (optlen >= 4 && optlen < remaining)
if (optlen >= 6 && optlen < remaining)
{
memcpy(&tmp, &ptr[DHCPD_OPTION_DATA], 4);
g_state.ds_optreqip = (in_addr_t)ntohl(tmp);
@ -638,7 +638,7 @@ static inline bool dhcpd_parseoptions(void)
case DHCP_OPTION_LEASE_TIME: /* IP address lease time */
optlen = ptr[DHCPD_OPTION_LENGTH] + 2;
if (optlen >= 4 && optlen < remaining)
if (optlen >= 6 && optlen < remaining)
{
memcpy(&tmp, &ptr[DHCPD_OPTION_DATA], 4);
g_state.ds_optleasetime = (time_t)ntohl(tmp);
@ -647,7 +647,7 @@ static inline bool dhcpd_parseoptions(void)
case DHCP_OPTION_MSG_TYPE: /* DHCP message type */
optlen = ptr[DHCPD_OPTION_LENGTH] + 2;
if (optlen >= 1 && optlen < remaining)
if (optlen >= 3 && optlen < remaining)
{
g_state.ds_optmsgtype = ptr[DHCPD_OPTION_DATA];
}
@ -655,7 +655,7 @@ static inline bool dhcpd_parseoptions(void)
case DHCP_OPTION_SERVER_ID: /* Server identifier */
optlen = ptr[DHCPD_OPTION_LENGTH] + 2;
if (optlen >= 4 && optlen < remaining)
if (optlen >= 6 && optlen < remaining)
{
memcpy(&tmp, &ptr[DHCPD_OPTION_DATA], 4);
g_state.ds_optserverip = (in_addr_t)ntohl(tmp);
@ -943,12 +943,6 @@ static void dhcpd_initpacket(uint8_t mtype)
{
g_state.ds_outpacket.flags = g_state.ds_inpacket.flags;
}
else
{
g_state.ds_outpacket.flags = 0;
}
memset(g_state.ds_outpacket.giaddr, 0, 4);
/* Add the generic options */