From: Benoît Ganne <bganne@cisco.com>
Date: Thu, 24 Feb 2022 15:17:52 +0000 (+0100)
Subject: ip: fix overflow in ip6_ext_header_walk
X-Git-Tag: v22.10-rc0~315
X-Git-Url: https://gerrit.fd.io/r/gitweb?a=commitdiff_plain;h=refs%2Fchanges%2F42%2F35542%2F2;p=vpp.git

ip: fix overflow in ip6_ext_header_walk

ip6_ext_hdr_chain_t->eh is IP6_EXT_HDR_MAX elements.

Type: fix

Change-Id: I28b8d610d8f5c0c520c8391c37b86e837655ab12
Signed-off-by: Benoît Ganne <bganne@cisco.com>
---

diff --git a/src/vnet/ip/ip6_packet.h b/src/vnet/ip/ip6_packet.h
index b00eac72c04..e71604ce7d3 100644
--- a/src/vnet/ip/ip6_packet.h
+++ b/src/vnet/ip/ip6_packet.h
@@ -652,7 +652,7 @@ ip6_ext_header_walk (vlib_buffer_t *b, ip6_header_t *ip, int find_hdr_type,
       i++;
       if (last)
 	break;
-      if (i > IP6_EXT_HDR_MAX)
+      if (i >= IP6_EXT_HDR_MAX)
 	break;
       next_header = ip6_ext_next_header_s (next_proto, next_header, max_offset,
 					   &offset, &next_proto, &last);