perl: CVE-2018-6797

(perl #132227) restart a node if we change to uni rules within the node and encounter...
This could lead to a buffer overflow.

(cherry picked from commit a02c70e35d1313a5f4e245e8f863c810e991172d)

Affects perl >= 5.18 && perl <= 5.26

(From OE-Core rev: 109ffd1b3d10753bfd711a14ad59b194ca3ce831)

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

meta/recipes-devtools/perl/perl/CVE-2018-6797.patch

@@ -0,0 +1,45 @@
+From abe1e6c568b96bcb382dfa4f61c56d1ab001ea51 Mon Sep 17 00:00:00 2001
+From: Karl Williamson <khw@cpan.org>
+Date: Fri, 2 Feb 2018 15:14:27 -0700
+Subject: [PATCH] (perl #132227) restart a node if we change to uni rules
+ within the node and encounter a sharp S
+
+This could lead to a buffer overflow.
+
+(cherry picked from commit a02c70e35d1313a5f4e245e8f863c810e991172d)
+
+CVE: CVE-2018-6797
+Upstream-Status: Backport [https://perl5.git.perl.org/perl.git/commitdiff/abe1e6c568b96bcb382dfa4f61c56d1ab001ea51]
+
+Signed-off-by: Jagadeesh Krishnanjanappa <jkrishnanjanappa@mvista.com>
+---
+ regcomp.c | 12 ++++++++++++
+ 1 file changed, 12 insertions(+)
+
+diff --git a/regcomp.c b/regcomp.c
+index 3b9550b10d..a7dee9a09e 100644
+--- a/regcomp.c
++++ b/regcomp.c
+@@ -13543,6 +13543,18 @@ S_regatom(pTHX_ RExC_state_t *pRExC_state, I32 *flagp, U32 depth)
+                          * /u.  This includes the multi-char fold SHARP S to
+                          * 'ss' */
+                         if (UNLIKELY(ender == LATIN_SMALL_LETTER_SHARP_S)) {
++
++                            /* If the node started out having uni rules, we
++                             * wouldn't have gotten here.  So this means
++                             * something in the middle has changed it, but
++                             * didn't think it needed to reparse.  But this
++                             * sharp s now does indicate the need for
++                             * reparsing. */
++                            if (RExC_uni_semantics) {
++                                p = oldp;
++                                goto loopdone;
++                            }
++
+                             RExC_seen_unfolded_sharp_s = 1;
+                             maybe_exactfu = FALSE;
+                         }
+-- 
+2.15.1-424-g9478a660812
+
+

meta/recipes-devtools/perl/perl_5.24.1.bb

@@ -68,6 +68,7 @@ SRC_URI += " \
         file://CVE-2017-12837.patch \
         file://CVE-2018-6798-1.patch \
         file://CVE-2018-6798-2.patch \
+        file://CVE-2018-6797.patch \
 "
 
 # Fix test case issues