cairo: Fix CVE-2017-9814

Backport patch from the following link to fix CVE-2017-9814:

    https://bugs.freedesktop.org/show_bug.cgi?id=101547

(From OE-Core rev: 4ff22f4bb10b83ea61218a01e12907a90edcd594)

Signed-off-by: Dengke Du <dengke.du@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-graphics/cairo/cairo/0001-cairo-Fix-CVE-2017-9814.patch

@@ -0,0 +1,45 @@
+From 042421e9e3d266ad0bb7805132041ef51ad3234d Mon Sep 17 00:00:00 2001
+From: Adrian Johnson <ajohnson@redneon.com>
+Date: Wed, 16 Aug 2017 22:52:35 -0400
+Subject: [PATCH] cairo: Fix CVE-2017-9814
+
+The bug happens because in some scenarios the variable size can
+have a value of 0 at line 1288. And malloc(0) is not returning
+NULL as some people could expect:
+
+    https://stackoverflow.com/questions/1073157/zero-size-malloc
+
+malloc(0) returns the smallest chunk possible. So the line 1290
+with the return is not execute. And the execution continues with
+an invalid map.
+
+Since the size is 0 the variable map is not initialized correctly
+at load_trutype_table. So, later when the variable map is accessed
+previous values from a freed chunk are used. This could allows an
+attacker to control the variable map.
+
+This patch have not merge in upstream now.
+
+Upstream-Status: Backport [https://bugs.freedesktop.org/show_bug.cgi?id=101547]
+CVE: CVE-2017-9814
+Signed-off-by: Dengke Du <dengke.du@windriver.com>
+---
+ src/cairo-truetype-subset.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/src/cairo-truetype-subset.c b/src/cairo-truetype-subset.c
+index e3449a0..f77d11c 100644
+--- a/src/cairo-truetype-subset.c
++++ b/src/cairo-truetype-subset.c
+@@ -1285,7 +1285,7 @@ _cairo_truetype_reverse_cmap (cairo_scaled_font_t *scaled_font,
+ 	return CAIRO_INT_STATUS_UNSUPPORTED;
+ 
+     size = be16_to_cpu (map->length);
+-    map = malloc (size);
++    map = _cairo_malloc (size);
+     if (unlikely (map == NULL))
+ 	return _cairo_error (CAIRO_STATUS_NO_MEMORY);
+ 
+-- 
+2.8.1
+

meta/recipes-graphics/cairo/cairo_1.14.10.bb

@@ -4,6 +4,7 @@ LIC_FILES_CHKSUM = "file://COPYING;md5=e73e999e0c72b5ac9012424fa157ad77"
 
 SRC_URI = "http://cairographics.org/releases/cairo-${PV}.tar.xz \
            file://cairo-get_bitmap_surface-bsc1036789-CVE-2017-7475.diff \ 
+           file://0001-cairo-Fix-CVE-2017-9814.patch \
           "
 
 SRC_URI[md5sum] = "146f5f4d0b4439fc3792fd3452b7b12a"