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From 81c0e81531623251a0e78f7779c049f530abe733 Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Wed, 2 Jan 2019 20:33:08 +0100
Subject: [PATCH] NTLM: fix size check condition for type2 received data

Bug: https://curl.haxx.se/docs/CVE-2018-16890.html
Reported-by: Wenxiang Qian
CVE-2018-16890

Upstream-commit: b780b30d1377adb10bbe774835f49e9b237fb9bb
Signed-off-by: Kamil Dudka <kdudka@redhat.com>
---
 lib/vauth/ntlm.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/lib/vauth/ntlm.c b/lib/vauth/ntlm.c
index cdb8d8f..b614cda 100644
--- a/lib/vauth/ntlm.c
+++ b/lib/vauth/ntlm.c
@@ -182,10 +182,11 @@ static CURLcode ntlm_decode_type2_target(struct Curl_easy *data,
     target_info_len = Curl_read16_le(&buffer[40]);
     target_info_offset = Curl_read32_le(&buffer[44]);
     if(target_info_len > 0) {
-      if(((target_info_offset + target_info_len) > size) ||
+      if((target_info_offset >= size) ||
+         ((target_info_offset + target_info_len) > size) ||
          (target_info_offset < 48)) {
         infof(data, "NTLM handshake failure (bad type-2 message). "
-                    "Target Info Offset Len is set incorrect by the peer\n");
+              "Target Info Offset Len is set incorrect by the peer\n");
         return CURLE_BAD_CONTENT_ENCODING;
       }
 
-- 
2.17.2