Fix CVE-2016-10195 (buffer overread in libevent's DNS code):

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-10195
https://github.com/libevent/libevent/issues/317

Patch copied from upstream source repository:

https://github.com/libevent/libevent/commit/96f64a022014a208105ead6c8a7066018449d86d

From 3c570970516f48da35f42fef98276531fcc0abaa Mon Sep 17 00:00:00 2001
From: Azat Khuzhin <a3at.mail@gmail.com>
Date: Mon, 1 Feb 2016 17:32:09 +0300
Subject: [PATCH] evdns: name_parse(): fix remote stack overread

---
 evdns.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/evdns.c b/evdns.c
index 60b10485..137c24ea 100644
--- a/evdns.c
+++ b/evdns.c
@@ -960,7 +960,6 @@ name_parse(u8 *packet, int length, int *idx, char *name_out, int name_out_len) {
 
 	for (;;) {
 		u8 label_len;
-		if (j >= length) return -1;
 		GET8(label_len);
 		if (!label_len) break;
 		if (label_len & 0xc0) {
@@ -981,6 +980,7 @@ name_parse(u8 *packet, int length, int *idx, char *name_out, int name_out_len) {
 			*cp++ = '.';
 		}
 		if (cp + label_len >= end) return -1;
+		if (j + label_len > length) return -1;
 		memcpy(cp, packet + j, label_len);
 		cp += label_len;
 		j += label_len;
-- 
2.11.0

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<div class='path'>path: <a href='/guix/log/?id=d3413b6f87f36758fa270eac694f69c79dde3867'>root</a>/<a href='/guix/log/gnu?id=d3413b6f87f36758fa270eac694f69c79dde3867'>gnu</a>/<a href='/guix/log/gnu/services?id=d3413b6f87f36758fa270eac694f69c79dde3867'>services</a>/<a href='/guix/log/gnu/services/dns.scm?id=d3413b6f87f36758fa270eac694f69c79dde3867'>dns.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/services/dns.scm?id=d3413b6f87f36758fa270eac694f69c79dde3867&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-10-06 08:13:39 +0200'>2020-10-06</span></td><td><a href='/guix/commit/gnu/services/dns.scm?id=34d1c0a03b51fdaef26a3bc630ab096da740e1d6'>services: dnsmasq: Add TFTP configuration fields.</a><span class='msg-avail'>...</span></td><td>Danny Milosavljevic</td></tr>
<tr><td><span title='2020-05-08 16:30:50 +0200'>2020-05-08</span></td><td><a href='/guix/commit/gnu/services/dns.scm?id=dd0804c67e99914eecc471fdb92f4220425a1cbc'>services: Add descriptions.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-05-02 13:00:24 +0800'>2020-05-02</span></td><td><a href='/guix/commit/gnu/services/dns.scm?id=5a0b78e62bc3122998990cea5ee17bdb2789aada'>services: dnsmasq: Support the --address flag.</a><span class='msg-avail'>...</span></td><td>Pierre Langlois</td></tr>
<tr><td><span title='2020-01-22 20:18:56 +0800'>2020-01-22</span></td><td><a href='/guix/commit/gnu/services/dns.scm?id=244db6bbc88fae7ba3426c057cfecb8706015939'>services: knot-resolver: Manage a root TA at /var/cache/knot-resolver.</a><span class='msg-avail'>...</span></td><td>宋文武</td></tr>
<tr><td><span title='2019-11-11 20:30:53 +0800'>2019-11-11</span></td><td><a href='/guix/commit/gnu/services/dns.scm?id=6ec68c69b08a873c5896dae9f8f234e44ea45738'>services: Add knot-resolver-service-type.</a><span class='msg-avail'>...</span></td><td>宋文武</td></tr>
<tr><td><span title='2019-04-27 15:56:35 +0200'>2019-04-27</span></td><td><a href='/guix/commit/gnu/services/dns.scm?id=b8e2bd4fc89f7fd60f74949563fb834dbd8f7660'>gnu: knot: Fix typos.</a><span class='msg-avail'>...</span></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2019-04-27 13:02:31 +0200'>2019-04-27</span></td><td><a href='/guix/commit/gnu/services/dns.scm?id=6cd7b1be7ea2b675e369c6cbb35b31b3c496648b'>gnu: knot: Add configuration fields.</a><span class='msg-avail'>...</span></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2019-04-27 00:19:41 +0200'>2019-04-27</span></td><td><a href='/guix/commit/gnu/services/dns.scm?id=435551f0faccb4f91cadc709ffb9819d850d7e69'>services: knot: Fix configuration file generation.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-04-26 18:37:48 +0200'>2019-04-26</span></td><td><a href='/guix/commit/gnu/services/dns.scm?id=e379d1b5efad293951fd35920bbf142376058696'>gnu: dns: Fix configuration formating.</a><span class='msg-avail'>...</span></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2019-04-25 21:44:55 +0200'>2019-04-25</span></td><td><a href='/guix/commit/gnu/services/dns.scm?id=92eb600f8a94afa36142f8f145efaa485b632433'>gnu: knot-service: Add includes field in configuration.</a><span class='msg-avail'>...</span></td><td>Julien Lepiller</td></tr>