Added security patch for CVE-2016-10219

Resolves: #1441569

ghostscript-9.20-cve-2016-10219.patch

@@ -0,0 +1,44 @@
+From 4bef1a1d32e29b68855616020dbff574b9cda08f Mon Sep 17 00:00:00 2001
+From: Robin Watts <Robin.Watts@artifex.com>
+Date: Thu, 29 Dec 2016 15:57:43 +0000
+Subject: [PATCH] Bug 697453: Avoid divide by 0 in scan conversion code.
+
+Arithmetic overflow due to extreme values in the scan conversion
+code can cause a division by 0.
+
+Avoid this with a simple extra check.
+
+  dx_old=cf814d81
+  endp->x_next=b0e859b9
+  alp->x_next=8069a73a
+
+leads to dx_den = 0
+---
+ base/gxfill.c | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/base/gxfill.c b/base/gxfill.c
+index 99196c0..2f81bb0 100644
+--- a/base/gxfill.c
++++ b/base/gxfill.c
+@@ -1741,7 +1741,7 @@ intersect(active_line *endp, active_line *alp, fixed y, fixed y1, fixed *p_y_new
+     fixed dx_old = alp->x_current - endp->x_current;
+     fixed dx_den = dx_old + endp->x_next - alp->x_next;
+ 
+-    if (dx_den <= dx_old)
++    if (dx_den <= dx_old || dx_den == 0)
+         return false; /* Intersection isn't possible. */
+     dy = y1 - y;
+     if_debug3('F', "[F]cross: dy=%g, dx_old=%g, dx_new=%g\n",
+@@ -1750,7 +1750,7 @@ intersect(active_line *endp, active_line *alp, fixed y, fixed y1, fixed *p_y_new
+     /* Do the computation in single precision */
+     /* if the values are small enough. */
+     y_new =
+-        ((dy | dx_old) < 1L << (size_of(fixed) * 4 - 1) ?
++        (((ufixed)(dy | dx_old)) < (1L << (size_of(fixed) * 4 - 1)) ?
+          dy * dx_old / dx_den :
+          (INCR_EXPR(mq_cross), fixed_mult_quo(dy, dx_old, dx_den)))
+         + y;
+-- 
+2.9.3
+

ghostscript.spec

@@ -33,6 +33,7 @@ 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
+Patch16: ghostscript-9.20-cve-2016-10219.patch
 
 Requires: %{name}-core%{?_isa} = %{version}-%{release}
 Requires: %{name}-x11%{?_isa} = %{version}-%{release}
@@ -167,6 +168,9 @@ rm -rf expat freetype icclib jasper jpeg jpegxr lcms lcms2 libpng openjpeg zlib
 # CVE-2016-10218 (bug #1441568):
 %patch15 -p1
 
+# CVE-2016-10219 (bug #1441569):
+%patch16 -p1
+
 # Convert manual pages to UTF-8
 from8859_1() {
         iconv -f iso-8859-1 -t utf-8 < "$1" > "${1}_"
@@ -367,6 +371,7 @@ rm -rf $RPM_BUILD_ROOT
 - Added security fixes for:
   - CVE-2016-10217 (bug #1441564)
   - CVE-2016-10218 (bug #1441568)
+  - CVE-2016-10219 (bug #1441569)
 
 * Thu Apr 06 2017 David Kaspar [Dee'Kej] <dkaspar@redhat.com> - 9.20-8
   Added security fix for CVE-2017-7207 (bug #1434497)