[gnome-continuous-yocto/gnomeostree-3.28-rocko: 5535/8267] ghostscript: CVE-2017-7207

[Emmanuele Bassi <ebassi src gnome org>]

commit 6df3fde8e952799b91f3812b4f7929d7a34cddfe
Author: Catalin Enache <catalin enache windriver com>
Date:   Wed Apr 5 15:06:51 2017 +0300

    ghostscript: CVE-2017-7207
    
    The mem_get_bits_rectangle function in Artifex Software, Inc.
    Ghostscript 9.20 allows remote attackers to cause a denial
    of service (NULL pointer dereference) via a crafted PostScript
    document.
    
    Reference:
    http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-7207
    
    Upstream patch:
    http://git.ghostscript.com/?p=ghostpdl.git;h=309eca4e0a31ea70dcc844812691439312dad091
    
    (From OE-Core rev: 0f22a27c2abd2f2dd9119681f139dd85dcb6479d)
    
    Signed-off-by: Catalin Enache <catalin enache windriver com>
    Signed-off-by: Richard Purdie <richard purdie linuxfoundation org>

 .../ghostscript/ghostscript/CVE-2017-7207.patch    |   39 ++++++++++++++++++++
 .../ghostscript/ghostscript_9.20.bb                |    1 +
 2 files changed, 40 insertions(+), 0 deletions(-)
---
diff --git a/meta/recipes-extended/ghostscript/ghostscript/CVE-2017-7207.patch 
b/meta/recipes-extended/ghostscript/ghostscript/CVE-2017-7207.patch
new file mode 100644
index 0000000..a05dc02
--- /dev/null
+++ b/meta/recipes-extended/ghostscript/ghostscript/CVE-2017-7207.patch
@@ -0,0 +1,39 @@
+From 0e88bee1304993668fede72498d656a2dd33a35e Mon Sep 17 00:00:00 2001
+From: Ken Sharp <ken sharp artifex com>
+Date: Mon, 20 Mar 2017 09:34:11 +0000
+Subject: [PATCH] Ensure a device has raster memory, before trying to read it.
+
+Bug #697676 "Null pointer dereference in mem_get_bits_rectangle()"
+
+This is only possible by abusing/mis-using Ghostscript-specific
+language extensions, so cannot happen in a general PostScript program.
+
+Nevertheless, Ghostscript should not crash. So this commit checks the
+memory device to see if raster memory has been allocated, before trying
+to read from it.
+
+Upstream-Status: Backport
+CVE: CVE-2017-7207
+
+Author: Ken Sharp <ken sharp artifex com>
+Signed-off-by: Catalin Enache <catalin enache windriver com>
+---
+ base/gdevmem.c | 2 ++
+ 1 file changed, 2 insertions(+)
+
+diff --git a/base/gdevmem.c b/base/gdevmem.c
+index 41108ba..183f96d 100644
+--- a/base/gdevmem.c
++++ b/base/gdevmem.c
+@@ -605,6 +605,8 @@ mem_get_bits_rectangle(gx_device * dev, const gs_int_rect * prect,
+             GB_PACKING_CHUNKY | GB_COLORS_NATIVE | GB_ALPHA_NONE;
+         return_error(gs_error_rangecheck);
+     }
++    if (mdev->line_ptrs == 0x00)
++        return_error(gs_error_rangecheck);
+     if ((w <= 0) | (h <= 0)) {
+         if ((w | h) < 0)
+             return_error(gs_error_rangecheck);
+-- 
+2.10.2
+
diff --git a/meta/recipes-extended/ghostscript/ghostscript_9.20.bb 
b/meta/recipes-extended/ghostscript/ghostscript_9.20.bb
index 210e9a7..e8fc5df 100644
--- a/meta/recipes-extended/ghostscript/ghostscript_9.20.bb
+++ b/meta/recipes-extended/ghostscript/ghostscript_9.20.bb
@@ -31,6 +31,7 @@ SRC_URI = "${SRC_URI_BASE} \
            file://ghostscript-9.02-genarch.patch \
            file://objarch.h \
            file://cups-no-gcrypt.patch \
+           file://CVE-2017-7207.patch \
            "
 
 SRC_URI_class-native = "${SRC_URI_BASE} \