X-Git-Url: https://gerrit.fd.io/r/gitweb?a=blobdiff_plain;f=src%2Fvnet%2Fip%2Fip.h;h=b114fcbaaf66af4987383f670ff547303e97955e;hb=8f39d55a298e08ac808da6988032f14d542627c6;hp=50965d411e6067bcf14fd3eb48e54a7d7fcd9027;hpb=ef91534e665cf343af2389df11d46559a1f83d78;p=vpp.git

diff --git a/src/vnet/ip/ip.h b/src/vnet/ip/ip.h
index 50965d411e6..b114fcbaaf6 100644
--- a/src/vnet/ip/ip.h
+++ b/src/vnet/ip/ip.h
@@ -162,7 +162,7 @@ ip_incremental_checksum_buffer (vlib_main_t * vm,
   void *h;
   u32 n;
 
-  n = clib_min (n_bytes_left, b->current_length);
+  n = clib_min (n_bytes_left, b->current_length - first_buffer_offset);
   h = vlib_buffer_get_current (b) + first_buffer_offset;
   sum = ip_incremental_checksum (sum, h, n);
   if (PREDICT_FALSE (b->flags & VLIB_BUFFER_NEXT_PRESENT))