Fix CVE-2018-10963:

http://bugzilla.maptools.org/show_bug.cgi?id=2795
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-10963

Patch copied from upstream source repository:

https://gitlab.com/libtiff/libtiff/commit/de144fd228e4be8aa484c3caf3d814b6fa88c6d9

From de144fd228e4be8aa484c3caf3d814b6fa88c6d9 Mon Sep 17 00:00:00 2001
From: Even Rouault <even.rouault@spatialys.com>
Date: Sat, 12 May 2018 14:24:15 +0200
Subject: [PATCH] TIFFWriteDirectorySec: avoid assertion. Fixes
 http://bugzilla.maptools.org/show_bug.cgi?id=2795. CVE-2018-10963

---
 libtiff/tif_dirwrite.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/libtiff/tif_dirwrite.c b/libtiff/tif_dirwrite.c
index 2430de6d..c15a28db 100644
--- a/libtiff/tif_dirwrite.c
+++ b/libtiff/tif_dirwrite.c
@@ -695,8 +695,11 @@ TIFFWriteDirectorySec(TIFF* tif, int isimage, int imagedone, uint64* pdiroff)
 								}
 								break;
 							default:
-								assert(0);   /* we should never get here */
-								break;
+								TIFFErrorExt(tif->tif_clientdata,module,
+								            "Cannot write tag %d (%s)",
+								            TIFFFieldTag(o),
+                                                                            o->field_name ? o->field_name : "unknown");
+								goto bad;
 						}
 					}
 				}
-- 
2.17.0

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<div class='path'>path: <a href='/guix/log/?id=52dbc3d0843b32f313fcb538788a3fff894f777d'>root</a>/<a href='/guix/log/gnu?id=52dbc3d0843b32f313fcb538788a3fff894f777d'>gnu</a>/<a href='/guix/log/gnu/packages?id=52dbc3d0843b32f313fcb538788a3fff894f777d'>packages</a>/<a href='/guix/log/gnu/packages/patches?id=52dbc3d0843b32f313fcb538788a3fff894f777d'>patches</a>/<a href='/guix/log/gnu/packages/patches/nss-3.56-pkgconfig.patch?id=52dbc3d0843b32f313fcb538788a3fff894f777d'>nss-3.56-pkgconfig.patch</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/packages/patches/nss-3.56-pkgconfig.patch?id=52dbc3d0843b32f313fcb538788a3fff894f777d&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2021-06-06 19:49:57 +0200'>2021-06-06</span></td><td><a href='/guix/commit/gnu/packages/patches/nss-3.56-pkgconfig.patch?id=79878c64b4bda523f50974c3f61b796309b1b8d9'>gnu: nss: Update to 3.66.</a><span class='msg-avail'>...</span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2021-01-26 14:22:34 -0500'>2021-01-26</span></td><td><a href='/guix/commit/gnu/packages/patches/nss-3.56-pkgconfig.patch?id=ced3d5cbf99eac429a45e33191335ec0662f1df3'>gnu: nss: Update to the latest changeset to resolve test failures.</a><span class='msg-avail'>...</span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2020-09-28 14:45:18 -0400'>2020-09-28</span></td><td><a href='/guix/commit/gnu/packages/patches/nss-3.56-pkgconfig.patch?id=1896c0c6ea3597c917bb57d41a7ca0ba29dbf3b1'>gnu: Add nss@3.56.</a><span class='msg-avail'>...</span></td><td>Jonathan Brielmaier</td></tr>