From a371f0fd8c029cbea493546a9b4f7946c44ff66c Mon Sep 17 00:00:00 2001
From: Thiago Macieira <thiago.macieira@intel.com>
Date: Thu, 9 May 2024 14:52:20 -0700
Subject: [PATCH] QDnsLookup/Unix: fix off-by-one error in parsing the reply
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Found this when the DNS server replied with no errors, no answers, and
no EDNS0 tail.

Amends eb51454b907b02aa67268c162896fc6778920e4c

Change-Id: Ie30a3caf09ef4176bb36fffd17cdf0916ac31545
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
(cherry picked from commit e3f520e621a9ea631d8a1d2f9bfc7a5f20dc698a)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
---
 src/network/kernel/qdnslookup_unix.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/network/kernel/qdnslookup_unix.cpp b/src/network/kernel/qdnslookup_unix.cpp
index bb13dcbdf06..722cc341e40 100644
--- a/src/network/kernel/qdnslookup_unix.cpp
+++ b/src/network/kernel/qdnslookup_unix.cpp
@@ -273,7 +273,7 @@ void QDnsLookupRunnable::query(QDnsLookupReply *reply)
         expandHost(offset);
         if (status < 0)
             return;
-        if (offset + status + 4 >= responseLength)
+        if (offset + status + 4 > responseLength)
             header->qdcount = 0xffff;   // invalid reply below
         else
             offset += status + 4;