Added security patch for CVE-2016-10218

Resolves: #1441568

ghostscript-9.20-cve-2016-10218.patch

@@ -0,0 +1,30 @@
+From c0502b3771e4eac89a199a3558182337d146d4ab Mon Sep 17 00:00:00 2001
+From: Michael Vrhel <michael.vrhel@artifex.com>
+Date: Thu, 29 Dec 2016 12:00:40 -0800
+Subject: [PATCH] Bug 697444 Unmatched transparency group pop
+
+This issue can only occur if there is an unmatched group pop.
+If the interpreter is doing that, then the interpreter is
+broken.  With this bug the user is intentionally doing it.
+We now throw and error when it occurs.
+---
+ base/gdevp14.c | 3 +++
+ 1 file changed, 3 insertions(+)
+
+diff --git a/base/gdevp14.c b/base/gdevp14.c
+index ad3478f..84f0f40 100644
+--- a/base/gdevp14.c
++++ b/base/gdevp14.c
+@@ -985,6 +985,9 @@ pdf14_pop_transparency_group(gs_gstate *pgs, pdf14_ctx *ctx,
+     bool blendspot = pdev->blendspot;
+     bool nonicc_conversion = true;
+ 
++    if (nos == NULL)
++        return_error(gs_error_unknownerror);  /* Unmatched group pop */
++
+ #ifdef DEBUG
+     pdf14_debug_mask_stack_state(ctx);
+ #endif
+-- 
+2.9.3
+

ghostscript.spec

@@ -32,6 +32,7 @@ Patch9: ghostscript-9.20-cve-2016-7977.patch
 Patch12: ghostscript-9.20-cve-2016-9601.patch
 Patch13: ghostscript-9.20-cve-2017-7207.patch
 Patch14: ghostscript-9.20-cve-2016-10217.patch
+Patch15: ghostscript-9.20-cve-2016-10218.patch
 
 Requires: %{name}-core%{?_isa} = %{version}-%{release}
 Requires: %{name}-x11%{?_isa} = %{version}-%{release}
@@ -163,6 +164,9 @@ rm -rf expat freetype icclib jasper jpeg jpegxr lcms lcms2 libpng openjpeg zlib
 # CVE-2016-10217 (bug #1441564):
 %patch14 -p1
 
+# CVE-2016-10218 (bug #1441568):
+%patch15 -p1
+
 # Convert manual pages to UTF-8
 from8859_1() {
         iconv -f iso-8859-1 -t utf-8 < "$1" > "${1}_"
@@ -362,6 +366,7 @@ rm -rf $RPM_BUILD_ROOT
 * Thu Apr 27 2017 David Kaspar [Dee'Kej] <dkaspar@redhat.com> - 9.20-9
 - Added security fixes for:
   - CVE-2016-10217 (bug #1441564)
+  - CVE-2016-10218 (bug #1441568)
 
 * Thu Apr 06 2017 David Kaspar [Dee'Kej] <dkaspar@redhat.com> - 9.20-8
   Added security fix for CVE-2017-7207 (bug #1434497)