gnu: cairo: Reintroduce security patches [security fixes].

Two patches were accidentally removed in commit
f94cdc86f6.

* gnu/packages/patches/cairo-CVE-2018-19876.patch,
gnu/packages/patches/cairo-CVE-2020-35492.patch: New files.
* gnu/local.mk (dist_patch_DATA): Add them.
* gnu/packages/gtk.scm (cairo)[patches]: Apply them.

gnu/local.mk

@@ -880,6 +880,8 @@ dist_patch_DATA =						\
   %D%/packages/patches/bpftrace-disable-bfd-disasm.patch	\
   %D%/packages/patches/busybox-CVE-2021-28831.patch		\
   %D%/packages/patches/byobu-writable-status.patch		\
+  %D%/packages/patches/cairo-CVE-2018-19876.patch		\
+  %D%/packages/patches/cairo-CVE-2020-35492.patch		\
   %D%/packages/patches/calibre-no-updates-dialog.patch		\
   %D%/packages/patches/calibre-remove-test-sqlite.patch		\
   %D%/packages/patches/calibre-remove-test-unrar.patch		\

gnu/packages/gtk.scm

@@ -142,7 +142,10 @@ tools have full access to view and control running applications.")
         (string-append "https://cairographics.org/releases/cairo-"
                        version ".tar.xz"))
        (sha256
-        (base32 "0c930mk5xr2bshbdljv005j3j8zr47gqmkry3q6qgvqky6rjjysy"))))
+        (base32 "0c930mk5xr2bshbdljv005j3j8zr47gqmkry3q6qgvqky6rjjysy"))
+       (patches (search-patches
+		 "cairo-CVE-2018-19876.patch"
+		 "cairo-CVE-2020-35492.patch"))))
     (build-system glib-or-gtk-build-system)
     (outputs '("out" "doc"))
     (arguments

gnu/packages/patches/cairo-CVE-2018-19876.patch

@@ -0,0 +1,37 @@
+Copied from Debian.
+
+From: Carlos Garcia Campos <cgarcia@igalia.com>
+Date: Mon, 19 Nov 2018 12:33:07 +0100
+Subject: ft: Use FT_Done_MM_Var instead of free when available in
+ cairo_ft_apply_variations
+
+Fixes a crash when using freetype >= 2.9
+
+[This is considered to be security-sensitive because WebKitGTK+ sets its
+own memory allocator, which is not compatible with system free(), making
+this a remotely triggerable denial of service or memory corruption.]
+
+Origin: upstream, commit:90e85c2493fdfa3551f202ff10282463f1e36645
+Bug: https://gitlab.freedesktop.org/cairo/cairo/merge_requests/5
+Bug-Debian: https://bugs.debian.org/916389
+Bug-CVE: CVE-2018-19876
+---
+ src/cairo-ft-font.c | 4 ++++
+ 1 file changed, 4 insertions(+)
+
+diff --git a/src/cairo-ft-font.c b/src/cairo-ft-font.c
+index 325dd61..981973f 100644
+--- a/src/cairo-ft-font.c
++++ b/src/cairo-ft-font.c
+@@ -2393,7 +2393,11 @@ skip:
+ done:
+         free (coords);
+         free (current_coords);
++#if HAVE_FT_DONE_MM_VAR
++        FT_Done_MM_Var (face->glyph->library, ft_mm_var);
++#else
+         free (ft_mm_var);
++#endif
+     }
+ }
+ 

gnu/packages/patches/cairo-CVE-2020-35492.patch

@@ -0,0 +1,49 @@
+Copied from Debian.
+
+From 03a820b173ed1fdef6ff14b4468f5dbc02ff59be Mon Sep 17 00:00:00 2001
+From: Heiko Lewin <heiko.lewin@worldiety.de>
+Date: Tue, 15 Dec 2020 16:48:19 +0100
+Subject: [PATCH] Fix mask usage in image-compositor
+
+[trimmed test case, since not used in Debian build]
+
+---
+ src/cairo-image-compositor.c                |   8 ++--
+
+--- cairo-1.16.0.orig/src/cairo-image-compositor.c
++++ cairo-1.16.0/src/cairo-image-compositor.c
+@@ -2601,14 +2601,14 @@ _inplace_src_spans (void *abstract_rende
+ 		    unsigned num_spans)
+ {
+     cairo_image_span_renderer_t *r = abstract_renderer;
+-    uint8_t *m;
++    uint8_t *m, *base = (uint8_t*)pixman_image_get_data(r->mask);
+     int x0;
+ 
+     if (num_spans == 0)
+ 	return CAIRO_STATUS_SUCCESS;
+ 
+     x0 = spans[0].x;
+-    m = r->_buf;
++    m = base;
+     do {
+ 	int len = spans[1].x - spans[0].x;
+ 	if (len >= r->u.composite.run_length && spans[0].coverage == 0xff) {
+@@ -2646,7 +2646,7 @@ _inplace_src_spans (void *abstract_rende
+ 				      spans[0].x, y,
+ 				      spans[1].x - spans[0].x, h);
+ 
+-	    m = r->_buf;
++	    m = base;
+ 	    x0 = spans[1].x;
+ 	} else if (spans[0].coverage == 0x0) {
+ 	    if (spans[0].x != x0) {
+@@ -2675,7 +2675,7 @@ _inplace_src_spans (void *abstract_rende
+ #endif
+ 	    }
+ 
+-	    m = r->_buf;
++	    m = base;
+ 	    x0 = spans[1].x;
+ 	} else {
+ 	    *m++ = spans[0].coverage;