Fix CVE-2017-14502:

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-14502
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=573

Patch copied from upstream source repository:

https://github.com/libarchive/libarchive/commit/5562545b5562f6d12a4ef991fae158bf4ccf92b6

From 5562545b5562f6d12a4ef991fae158bf4ccf92b6 Mon Sep 17 00:00:00 2001
From: Joerg Sonnenberger <joerg@bec.de>
Date: Sat, 9 Sep 2017 17:47:32 +0200
Subject: [PATCH] Avoid a read off-by-one error for UTF16 names in RAR
 archives.

Reported-By: OSS-Fuzz issue 573
---
 libarchive/archive_read_support_format_rar.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/libarchive/archive_read_support_format_rar.c b/libarchive/archive_read_support_format_rar.c
index cbb14c32..751de697 100644
--- a/libarchive/archive_read_support_format_rar.c
+++ b/libarchive/archive_read_support_format_rar.c
@@ -1496,7 +1496,11 @@ read_header(struct archive_read *a, struct archive_entry *entry,
         return (ARCHIVE_FATAL);
       }
       filename[filename_size++] = '\0';
-      filename[filename_size++] = '\0';
+      /*
+       * Do not increment filename_size here as the computations below
+       * add the space for the terminating NUL explicitly.
+       */
+      filename[filename_size] = '\0';
 
       /* Decoded unicode form is UTF-16BE, so we have to update a string
        * conversion object for it. */
-- 
2.15.1

bf5ae70ca48e0527e8e8db8db'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/tests/dsa.key'>
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<option value='grep'>log msg</option>
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<input class='txt' type='search' size='10' name='q' value=''/>
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</td></tr></table>
<div class='path'>path: <a href='/guix/log/?id=4e869b180a94aa5bf5ae70ca48e0527e8e8db8db'>root</a>/<a href='/guix/log/tests?id=4e869b180a94aa5bf5ae70ca48e0527e8e8db8db'>tests</a>/<a href='/guix/log/tests/dsa.key?id=4e869b180a94aa5bf5ae70ca48e0527e8e8db8db'>dsa.key</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/tests/dsa.key?id=4e869b180a94aa5bf5ae70ca48e0527e8e8db8db&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-05-04 09:56:12 +0200'>2020-05-04</span></td><td><a href='/guix/commit/tests/dsa.key?id=43408e304ffb1149f35cb539b40d673d567c9116'>Add (guix openpgp).</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>