gdhcp: Add option and length checks

diff --git a/gdhcp/client.c b/gdhcp/client.c
index 3d27b4a..b9f8da6 100644 (file)
--- a/gdhcp/client.c
+++ b/gdhcp/client.c
@@ -1596,6 +1596,9 @@ static GList *get_addresses(GDHCPClient *dhcp_client,
        uint8_t *option;
        char *str;
 
+       if (value == NULL || len < 4)
+               return NULL;
+
        iaid = get_uint32(&value[0]);
        if (dhcp_client->iaid != iaid)
                return NULL;
@@ -1700,6 +1703,9 @@ static GList *get_dhcpv6_option_value_list(GDHCPClient *dhcp_client,
        char *str;
        int i;
 
+       if (value == NULL)
+               return NULL;
+
        switch (code) {
        case G_DHCPV6_DNS_SERVERS:      /* RFC 3646, chapter 3 */
        case G_DHCPV6_SNTP_SERVERS:     /* RFC 4075, chapter 4 */