dhcp: fix proxy dhcpv6 size check

[vpp.git] / src / plugins / dhcp / dhcp6_proxy_node.c

diff --git a/src/plugins/dhcp/dhcp6_proxy_node.c b/src/plugins/dhcp/dhcp6_proxy_node.c
index 929b49e..272c379 100644 (file)
--- a/src/plugins/dhcp/dhcp6_proxy_node.c
+++ b/src/plugins/dhcp/dhcp6_proxy_node.c
@@ -315,8 +315,9 @@ dhcpv6_proxy_to_server_input (vlib_main_t * vm,
 
        link_address_set:
 
-         if ((b0->current_length + sizeof (*id1) + sizeof (*vss1) +
-              sizeof (*cmac)) > vlib_buffer_get_default_data_size (vm))
+         if ((b0->current_data + b0->current_length + sizeof (*id1) +
+              sizeof (*vss1) + sizeof (*cmac)) >
+             vlib_buffer_get_default_data_size (vm))
            {
              error0 = DHCPV6_PROXY_ERROR_PKT_TOO_BIG;
              next0 = DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_DROP;