Fix CVE-2017-9936:

http://bugzilla.maptools.org/show_bug.cgi?id=2706
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-9936
https://security-tracker.debian.org/tracker/CVE-2017-9936

Patch lifted from upstream source repository (the changes to 'ChangeLog'
don't apply to the libtiff 4.0.8 release tarball).

3rd party Git reference:

https://github.com/vadz/libtiff/commit/fe8d7165956b88df4837034a9161dc5fd20cf67a

2017-06-26  Even Rouault <even.rouault at spatialys.com>

        * libtiff/tif_jbig.c: fix memory leak in error code path of
JBIGDecode()
        Fixes http://bugzilla.maptools.org/show_bug.cgi?id=2706
        Reported by team OWL337

/cvs/maptools/cvsroot/libtiff/ChangeLog,v  <--  ChangeLog
new revision: 1.1254; previous revision: 1.1253
/cvs/maptools/cvsroot/libtiff/libtiff/tif_jbig.c,v  <--  libtiff/tif_jbig.c
new revision: 1.16; previous revision: 1.15

Index: libtiff/libtiff/tif_jbig.c
===================================================================
RCS file: /cvs/maptools/cvsroot/libtiff/libtiff/tif_jbig.c,v
retrieving revision 1.15
retrieving revision 1.16
diff -u -r1.15 -r1.16
--- libtiff/libtiff/tif_jbig.c	10 Mar 2010 18:56:48 -0000	1.15
+++ libtiff/libtiff/tif_jbig.c	26 Jun 2017 15:20:00 -0000	1.16
@@ -1,4 +1,4 @@
-/* $Id: tif_jbig.c,v 1.15 2010-03-10 18:56:48 bfriesen Exp $ */
+/* $Id: tif_jbig.c,v 1.16 2017-06-26 15:20:00 erouault Exp $ */
 
 /*
  * Copyright (c) 1988-1997 Sam Leffler
@@ -94,6 +94,7 @@
 			     jbg_strerror(decodeStatus)
 #endif
 			     );
+		jbg_dec_free(&decoder);
 		return 0;
 	}
 
guix/log/tests/profiles.scm'>
<input type='hidden' name='id' value='cf1216d8763adf3c5e9d79d7abd2c5ecc8861d60'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/guix/log/?id=cf1216d8763adf3c5e9d79d7abd2c5ecc8861d60'>root</a>/<a href='/guix/log/tests?id=cf1216d8763adf3c5e9d79d7abd2c5ecc8861d60'>tests</a>/<a href='/guix/log/tests/profiles.scm?id=cf1216d8763adf3c5e9d79d7abd2c5ecc8861d60'>profiles.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/tests/profiles.scm?id=cf1216d8763adf3c5e9d79d7abd2c5ecc8861d60&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2022-10-22 01:46:55 +0200'>2022-10-22</span></td><td><a href='/guix/commit/tests/profiles.scm?id=a3619079f95213c4f983e69210ed12b38fd31022'>Remove now unnecessary uses of (guix grafts).</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2022-07-08 23:58:11 +0200'>2022-07-08</span></td><td><a href='/guix/commit/tests/profiles.scm?id=89e22887510ba5d546a4d7e391462e648942a7b6'>profiles: Support the creation of profiles with version 3 manifests.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2022-07-01 23:29:16 +0200'>2022-07-01</span></td><td><a href='/guix/commit/tests/profiles.scm?id=4ff12d1de7cd617b791996ee7ca1240660b4c20e'>profiles: Do not repeat entries in 'manifest' file.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2022-07-01 23:29:16 +0200'>2022-07-01</span></td><td><a href='/guix/commit/tests/profiles.scm?id=9b8c442b254b82196fe2492142b3c3bbbd891a1b'>tests: Augment profile collision test.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2022-05-31 14:53:34 -0400'>2022-05-31</span></td><td><a href='/guix/commit/tests/profiles.scm?id=4f18b13436f52c107e66056a9dd3a13bb99c8030'>gnu: Remove python2-matplotlib.</a><span class='msg-avail'>...</span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2022-02-11 23:51:39 +0100'>2022-02-11</span></td><td><a href='/guix/commit/tests/profiles.scm?id=bc1ad69605b6c3e2744694758d63dfc216107a82'>tests: Pass #:guile to 'computed-file' &amp; co.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>