gawk: backport Debian patch to fix CVE-2023-4156

Upstream-Status: Backport
[https://git.launchpad.net/ubuntu/+source/gawk/tree/debian/patches?h=ubuntu/focal-security
&
https://git.savannah.gnu.org/gitweb/?p=gawk.git;a=commitdiff;h=e709eb829448ce040087a3fc5481db6bfcaae212]

(From OE-Core rev: 68412b76948ce185d87fda73ead7b73e5ad6defd)

Signed-off-by: Vijay Anusuri <vanusuri@mvista.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>

meta/recipes-extended/gawk/gawk/CVE-2023-4156.patch

@@ -0,0 +1,28 @@
+From e709eb829448ce040087a3fc5481db6bfcaae212 Mon Sep 17 00:00:00 2001
+From: "Arnold D. Robbins" <arnold@skeeve.com>
+Date: Wed, 3 Aug 2022 13:00:54 +0300
+Subject: [PATCH] Smal bug fix in builtin.c.
+
+Upstream-Status: Backport [import from ubuntu https://git.launchpad.net/ubuntu/+source/gawk/tree/debian/patches/CVE-2023-4156.patch?h=ubuntu/focal-security
+Upstream commit https://git.savannah.gnu.org/gitweb/?p=gawk.git;a=commitdiff;h=e709eb829448ce040087a3fc5481db6bfcaae212]
+CVE: CVE-2023-4156
+Signed-off-by: Vijay Anusuri <vanusuri@mvista.com>
+---
+ ChangeLog | 6 ++++++
+ builtin.c | 5 ++++-
+ 2 files changed, 10 insertions(+), 1 deletion(-)
+
+--- gawk-5.1.0.orig/builtin.c
++++ gawk-5.1.0/builtin.c
+@@ -957,7 +957,10 @@ check_pos:
+ 					s1++;
+ 					n0--;
+ 				}
+-				if (val >= num_args) {
++				// val could be less than zero if someone provides a field width
++				// so large that it causes integer overflow. Mainly fuzzers do this,
++				// but let's try to be good anyway.
++				if (val < 0 || val >= num_args) {
+ 					toofew = true;
+ 					break;
+ 				}

meta/recipes-extended/gawk/gawk_5.0.1.bb

@@ -18,6 +18,7 @@ PACKAGECONFIG[mpfr] = "--with-mpfr,--without-mpfr, mpfr"
 SRC_URI = "${GNU_MIRROR}/gawk/gawk-${PV}.tar.gz \
            file://remove-sensitive-tests.patch \
            file://run-ptest \
+           file://CVE-2023-4156.patch \
 "
 
 SRC_URI[md5sum] = "c5441c73cc451764055ee65e9a4292bb"