From 125273a3568bb344afbe50d28c791aebb7f96290 Mon Sep 17 00:00:00 2001
From: Zuzana Svetlikova <zsvetlik@redhat.com>
Date: Sat, 24 Jun 2017 09:34:44 +0200
Subject: [PATCH] c-ares NAPTR parser out of bounds access

CVE: CVE-2017-1000381
Upstream bug: https://c-ares.haxx.se/adv_20170620.html
---
 deps/cares/src/ares_parse_naptr_reply.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/deps/cares/src/ares_parse_naptr_reply.c b/deps/cares/src/ares_parse_naptr_reply.c
index 11634df9847cc9..717d355778117f 100644
--- a/deps/cares/src/ares_parse_naptr_reply.c
+++ b/deps/cares/src/ares_parse_naptr_reply.c
@@ -110,6 +110,12 @@ ares_parse_naptr_reply (const unsigned char *abuf, int alen,
           status = ARES_EBADRESP;
           break;
         }
+      /* RR must contain at least 7 bytes = 2 x int16 + 3 x name */
+      if (rr_len < 7)
+        {
+          status = ARES_EBADRESP;
+          break;
+        }
 
       /* Check if we are really looking at a NAPTR record */
       if (rr_class == C_IN && rr_type == T_NAPTR)
@@ -185,4 +191,3 @@ ares_parse_naptr_reply (const unsigned char *abuf, int alen,
 
   return ARES_SUCCESS;
 }
-