ip: fix length calculation in ip6-receive

Replace unconditional usage of
buffer->total_length_not_including_first_buffer with a logic checking
whether that length is set to a valid value.

Type: fix
Fixes: 17478e4eb81d384f171ca27c9110a051cd434f16
Signed-off-by: Klement Sekera <ksekera@cisco.com>
Change-Id: I161d0957d62cc23826edd821aa5560bcfc5c1a33

diff --git a/src/vnet/ip/ip6_forward.c b/src/vnet/ip/ip6_forward.c
index 5b7704e..ce165e0 100644 (file)
--- a/src/vnet/ip/ip6_forward.c
+++ b/src/vnet/ip/ip6_forward.c
@@ -1276,7 +1276,7 @@ ip6_tcp_udp_icmp_bad_length (vlib_main_t * vm, vlib_buffer_t * p0)
     }
 
   n_bytes_left -= n_this_buffer;
-  n_bytes_left -= p0->total_length_not_including_first_buffer;
+  n_bytes_left -= vlib_buffer_length_in_chain (vm, p0) - p0->current_length;
 
   if (n_bytes_left == 0)
     return 0;