ruby: fix CVE-2017-9224

Use DATA_ENSURE(1) before access.

(From OE-Core rev: 9db907a0bd331c47c4882b82f9f1d2a7ef1f6d1f)

(From OE-Core rev: 7ba25f0d8d95ece5f5d56ace5b1e9c8c797efbc0)

Signed-off-by: Joe Slater <jslater@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

Fixed up to get to apply

Signed-off-by: Armin Kuster <akuster808@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/ruby/ruby/ruby-CVE-2017-9224.patch

@@ -0,0 +1,41 @@
+From 690313a061f7a4fa614ec5cc8368b4f2284e059b Mon Sep 17 00:00:00 2001
+From: "K.Kosako" <kosako@sofnec.co.jp>
+Date: Tue, 23 May 2017 10:28:58 +0900
+Subject: [PATCH] fix #57 : DATA_ENSURE() check must be before data access
+
+---
+ regexec.c |    5 -----
+ 1 file changed, 5 deletions(-)
+
+--- end of original header
+
+CVE: CVE-2017-9224
+
+Context modified so that patch applies for version 2.4.1.
+
+Upstream-Status: Pending
+Signed-off-by: Joe Slater <joe.slater@windriver.com>
+
+
+diff --git a/regexec.c b/regexec.c
+index 35fef11..d4e577d 100644
+--- a/regexec.c
++++ b/regexec.c
+@@ -1473,14 +1473,9 @@ match_at(regex_t* reg, const UChar* str, const UChar* end,
+       NEXT;
+
+     CASE(OP_EXACT1)  MOP_IN(OP_EXACT1);
+-#if 0
+       DATA_ENSURE(1);
+       if (*p != *s) goto fail;
+       p++; s++;
+-#endif
+-      if (*p != *s++) goto fail;
+-      DATA_ENSURE(0);
+-      p++;
+       MOP_OUT;
+       break;
+ 
+-- 
+1.7.9.5
+

meta/recipes-devtools/ruby/ruby_2.4.0.bb

@@ -1,5 +1,9 @@
 require ruby.inc
 
+SRC_URI += " \
+           file://ruby-CVE-2017-9224.patch \
+           "
+
 SRC_URI[md5sum] = "7e9485dcdb86ff52662728de2003e625"
 SRC_URI[sha256sum] = "152fd0bd15a90b4a18213448f485d4b53e9f7662e1508190aa5b702446b29e3d"