ghostscript: CVE-2016-8602, CVE-2017-7975

The .sethalftone5 function in psi/zht2.c in Ghostscript before 9.21 allows remote
attackers to cause a denial of service (application crash) or possibly execute
arbitrary code via a crafted Postscript document that calls .sethalftone5 with an
empty operand stack.

Artifex jbig2dec 0.13, as used in Ghostscript, allows out-of-bounds writes because
of an integer overflow in the jbig2_build_huffman_table function in jbig2_huffman.c
during operations on a crafted JBIG2 file, leading to a denial of service (application
crash) or possibly execution of arbitrary code.

References:
https://nvd.nist.gov/vuln/detail/CVE-2016-8602
https://nvd.nist.gov/vuln/detail/CVE-2017-7975

Upstream patches:
http://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=f5c7555c303
http://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=5e57e483298

(From OE-Core rev: 8f919c2df47ca93132f21160d919b6ee2207d9a6)

(From OE-Core rev: 6040b8735b79397bf49a2154f81e9aab34c15413)

Signed-off-by: Catalin Enache <catalin.enache@windriver.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-extended/ghostscript/ghostscript/CVE-2016-8602.patch

@@ -0,0 +1,47 @@
+From f5c7555c30393e64ec1f5ab0dfae5b55b3b3fc78 Mon Sep 17 00:00:00 2001
+From: Chris Liddell <chris.liddell@artifex.com>
+Date: Sat, 8 Oct 2016 16:10:27 +0100
+Subject: [PATCH] Bug 697203: check for sufficient params in .sethalftone5
+
+and param types
+
+Upstream-Status: Backport
+CVE: CVE-2016-8602
+
+Signed-off-by: Catalin Enache <catalin.enache@windriver.com>
+---
+ psi/zht2.c | 12 ++++++++++--
+ 1 file changed, 10 insertions(+), 2 deletions(-)
+
+diff --git a/psi/zht2.c b/psi/zht2.c
+index fb4a264..dfa27a4 100644
+--- a/psi/zht2.c
++++ b/psi/zht2.c
+@@ -82,14 +82,22 @@ zsethalftone5(i_ctx_t *i_ctx_p)
+     gs_memory_t *mem;
+     uint edepth = ref_stack_count(&e_stack);
+     int npop = 2;
+-    int dict_enum = dict_first(op);
++    int dict_enum;
+     ref rvalue[2];
+     int cname, colorant_number;
+     byte * pname;
+     uint name_size;
+     int halftonetype, type = 0;
+     gs_gstate *pgs = igs;
+-    int space_index = r_space_index(op - 1);
++    int space_index;
++
++    if (ref_stack_count(&o_stack) < 2)
++        return_error(gs_error_stackunderflow);
++    check_type(*op, t_dictionary);
++    check_type(*(op - 1), t_dictionary);
++
++    dict_enum = dict_first(op);
++    space_index = r_space_index(op - 1);
+ 
+     mem = (gs_memory_t *) idmemory->spaces_indexed[space_index];
+ 
+-- 
+2.10.2
+

meta/recipes-extended/ghostscript/ghostscript/CVE-2017-7975.patch

@@ -0,0 +1,36 @@
+From 5e57e483298dae8b8d4ec9aab37a526736ac2e97 Mon Sep 17 00:00:00 2001
+From: Shailesh Mistry <shailesh.mistry@hotmail.co.uk>
+Date: Wed, 26 Apr 2017 22:12:14 +0100
+Subject: [PATCH] Bug 697693: Prevent SEGV due to integer overflow.
+
+While building a Huffman table, the start and end points were susceptible
+to integer overflow.
+
+Thank you to Jiaqi for finding this issue and suggesting a patch.
+
+Upstream-Status: Backport
+CVE: CVE-2017-7975
+
+Signed-off-by: Catalin Enache <catalin.enache@windriver.com>
+---
+ jbig2dec/jbig2_huffman.c | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/jbig2dec/jbig2_huffman.c b/jbig2dec/jbig2_huffman.c
+index 511e461..b4189a1 100644
+--- a/jbig2dec/jbig2_huffman.c
++++ b/jbig2dec/jbig2_huffman.c
+@@ -421,8 +421,8 @@ jbig2_build_huffman_table(Jbig2Ctx *ctx, const Jbig2HuffmanParams *params)
+ 
+             if (PREFLEN == CURLEN) {
+                 int RANGELEN = lines[CURTEMP].RANGELEN;
+-                int start_j = CURCODE << shift;
+-                int end_j = (CURCODE + 1) << shift;
++                uint32_t start_j = CURCODE << shift;
++                uint32_t end_j = (CURCODE + 1) << shift;
+                 byte eflags = 0;
+ 
+                 if (end_j > max_j) {
+-- 
+2.10.2
+

meta/recipes-extended/ghostscript/ghostscript_9.20.bb

@@ -35,6 +35,8 @@ SRC_URI = "${SRC_URI_BASE} \
            file://CVE-2016-10219.patch \
            file://CVE-2016-10220.patch \
            file://CVE-2017-5951.patch \
+           file://CVE-2016-8602.patch \
+           file://CVE-2017-7975.patch \
            "
 
 SRC_URI_class-native = "${SRC_URI_BASE} \